Holder for pipe in heat exchanger, method and device for manufacturing heat exchanger using said holder, and air conditioner and/or outdoor unit having said heat exchanger

ABSTRACT

The current invention provides a tube-grasping body for grasping an insert tube in a heat exchanger, and heat exchanger production methods and apparatuses utilizing the tube-grasping body, wherein the tube-grasping body enables to enlarge and connect an insert tube to a heat radiating fin for producing a heat exchanger, still keeping the total length of insert tubes at an almost same level even after the enlargement; and the tube-grasping body is connected at its exterior to the guide-pipe.

FIELD OF THE INVENTION

The current invention relates to a tube-grasping body for grasping aninsert tube in a heat exchanger, heat exchanger production methods andapparatuses utilizing the tube-grasping body, and an air conditionerand/or an outdoor unit equipped with the heat exchanger produced by themethods and apparatuses.

BACKGROUND OF THE INVENTION

Japanese patent No. 63-188433 (hereinafter referred to as ‘the InventionA’) and No. 10-85878 (applied by the applicant of the current patentapplication, and hereinafter referred to as ‘the Invention B’) areexamples of the prior arts, which keep the entire length of insert tubesbeing enlarged, at an almost same level, even after the enlargement.

That is, as shown in FIG. 12( a), as a method of fixing a hairpin tube 7at a heat radiating fin by inserting a tube-enlarging mandrel 2 into theopening 7 b of said hairpin tube 7 in a heat exchanger 5, in aconfiguration where multiple hairpin tubes 7 are inserted into multipleheat radiating fins 6 which are overlaid and separated by a prescribedspace isolation, ‘the Invention A’ provides a method wherein the hairpinpart 7 c of said hairpin tube 7 is fixed by a hook body 10 which is notmovable toward said opening 7 b; then the tube 7 is enlarged at the sideof the opening 7 b, rather than the side of the heat radiating fin 6, byinserting the tube-enlarging mandrel 2 from the opening 7 b of the tube7, and then the enlargement portion 7 d is fixed in the through hole 9of the clamp 8 which is not movable toward the said hairpin part 7 c;then, the tube-enlarging mandrel 2 is inserted into the hairpin tube 7,in the state where the hairpin tube 7 is fixed by the clamp not to movetoward the hairpin part 7 and the hairpin tube 7 is fixed by the hookbody 10 not to move toward the opening 7 b.

According to the method above, after the side of the opening 7 b of thehairpin tube 7, rather than the side of the heat radiating fin 6, isfixed in the through hole 9 of the clamp 8 at the side of the opening 7b not to move toward the hairpin part 7 c, the hairpin tube 7 tends toshrink during the enlargement process of inserting the tube-enlargingmandrel 2. However, since the hairpin part 7 c is also fixed by the hookbody 10, shrinkage of the hairpin tube 7 is prevented and absorbed byreducing the thickness in the hairpin tube 7. As a result, shrinkage inthe entire length of tubes is kept at a minimum even after theenlargement.

However, the heat exchanger production method explained above hasproblems as detailed below.

That is, in the method above, as shown in FIG. 12( b), since the opening7 b of the hairpin tube 7 is fixed in the through hole 9 of the clamp 8,if hairpin tubes are inserted in a zigzag pattern in multiple columnssuch as columns of 3, 4, or etc., there exists a problem that hairpintubes 7 sitting at the interior side in the heat exchanger cannot befixed by the clamp 8.

On the other hand, as shown in (c) in the same figure, the problem abovecan be resolved, by mechanically varying the diameter of the throughhole 9 of the clamp 8, by an aperture-like tool operating like anaperture in a camera. However, if the space between each of hairpintubes 7 is fully taken up with complex components, or if said space issmaller than the gap between said aperture-like tools, there exists aspace problem for setting up said aperture-like tools, and thus thelimiting factor stated above still develops.

Also, if the diameter of the hairpin tube being enlarged in the heatexchanger 5 is changed according to the spec of the heat exchanger 5,the through holes 9 of the clamp 8 can no longer firmly fix the side ofthe opening 7 b of the hairpin tube 7. Also, other various similarproblems develop.

Thus, to resolve all of the problems stated above, the applicant of thisapplication applied ‘the Invention B’ for the patent registration.According to ‘the invention B’, as shown in FIG. 1, in a heat exchangerproduction apparatus 1 configured with the main body 1 a installed onthe base platform 1 b, 1 c is the component-loading platform of the heatexchanger 5, which is vertically installed on said base platform 1 b.Inside said heat exchanger 5, a plurality of hairpin tubes 7 withprescribed lengths are inserted in a row (not shown in the figure) intomultiple heat radiating fins 6 along the surface of thecomponent-loading platform 1 c. Also, above said component-loadingplatform 1 c, a pressing-plate 11 is installed to elevate in order topress and fix said heat exchanger 5 between the component-loadingplatform 1 c and the pressing-plate 11.

2 represents the tube-enlarging mandrel which is installed for movingback and forth on said main body 1 a, keeping its horizontal status. Asshown in FIGS. 2( a) and (b), the tube-enlarging mandrel 2 is connectedfrom its exterior to the tube-grasping body 3 to enable to move thetube-grasping body along the tube-enlarging mandrel 2. Saidtube-grasping body 3 is equipped with a plurality of tube-contactingparts 3 f on which the slopes 3 b are formed and slanted in the wideningdirection, toward the side of the opening 7 b of the corresponding tube7, and which are capable of radially expanding or axially compressing(the arrow E) in the cross direction of the longitudinal length of saidhairpin tube 7. Said slope 3 b is formed to reach the end-line 3 o ofthe tube-contacting part 3 f. Said tube-grasping body 3 is screwed andconnected to the tube-grasping body holder 3 l by the bolt 3 k formed atthe other side, the opposite side of said tube-contacting parts 3 f.Said tube-grasping body holder 3 l is capable of moving back and forth(the arrow F) by a sliding means such as a cylinder (not shown in thefigure), in the longitudinal direction of the hairpin tube 7, within aprescribed pitch. Also, the guide-pipe 3 c is screwed and connected tothe guide-pipe holder 3 d by the bolt 3 h formed at the other side. Saidguide-pipe holder 3 d is capable of moving back and forth (the arrow G)by a sliding means such as a cylinder (not shown in the figure).

Four of said tube-contacting parts 3 f of the tube-grasping body 3 areformed in the longitudinal direction of said tube-enlarging mandrel 2 toenclose the exterior circumferential surface of said tube-enlargingmandrel 2 (for example, if 6 is proper for a specific exterior diameterof the tube, then 6 or other number is set). Also, between thetube-contacting parts 3 f, slits, each of which has a uniform length anda uniform separation width of a prescribed width 3 u, are formed at fourplaces (the quantity of such slits does not have to be 4 and is properlydetermined in proportion to the count of tube-contacting parts 3 f).Through said slits, the diameter of each of the tube-contacting parts 3f is decreased in the axial direction of the tube-enlarging mandrel 2,as the guide-pipe 3 c is advanced, by the guide-pipe holder 3 d, towardthe heat exchanger, in order to press and slide along the slope 3 bwhich has been formed on the exterior surface of each of saidtube-contacting parts 3 f, and which is slanted in the wideningdirection toward the opening 7 b of the corresponding tube 7. It isstructured by a so-called collet chuck. The tube-grasping bodies 3 intheir multitudes (not shown in the figure) with said pluraltube-contacting parts 3 f are installed along the surface of saidcomponent-loading platform 1 c, in order to be faced with each of theopening 7 b of hairpin tubes 7 being inserted into the heat exchanger 5.

4 is an enclosing-body shifting device comprising: a pair ofenclosing-bodies 4 a which is installed on said base platform 1 b, andwhich is supported to rotate to enclose the hairpin part 7 c of thehairpin tube 7 being inserted into the heat radiating fin 6 of said heatexchanger 5; a driving-cylinder 4 e to drive to open or close saidenclosing-body 4 a; a base plane 4 d with said driving-cylinder 4 e anda pair of enclosing-bodies 4 a; a guide rail 12 to slide said base plane4 d, to or from said component-loading 1 c; and a round-trip cylinder 4f which enables said base plane 4 d to move back and forth. Multiplequantity (not shown in the figure) of said pair of enclosing-bodies 4 aare installed along the plane of said component-loading platform 1 c, tobe faced with each of the hairpin part 7 c of hairpin tubes 7 which areinserted into the heat radiating fin 6 of the heat exchanger 5.

Explanation is given below about production of a heat exchanger 5,wherein a heat exchanger production apparatus 1 utilizes thetube-grasping body 3 configured as above, and the tube-enlarging mandrel2 is inserted into the hairpin tube 7. First, as shown in FIG. 1, theheat exchanger 5 is installed on said component-loading platform 1 c,and, subsequently, said heat exchanger 5 is pressed and fixed betweenthe component-loading platform 1 c and the pressing-plate 11, bylowering the pressing-plate 11 located above.

Next, the base plane 4 d is advanced (not shown in the figure) along theguide rail 12, by operating the round-trip cylinder 4 f of theenclosing-body shifting device 4. At the same time, the driving-cylinder4 e is operated, in order to enclose the hairpin part 7 c of each ofhairpin tubes 7, as indicated in FIG. 11, by the tongue shaped concavity4 g which resembles a tongue when viewed from the plane of a pair ofenclosing-bodies 4 a. Corresponding to said tongue shaped concavity 4 g,a tongue shaped convexity 4 c, which resembles a tongue when viewed fromsaid plane, is formed on the interior surface of said tongue shapedconcavity 4 g. Said tongue shaped convexity 4 c turns around theU-shaped interior circumferential surface of said hairpin part 7 c inorder to firmly stop the shrinkage of the hairpin tube 7 during theenlarging process.

Next, from the opening 7 b of each of said hairpin tubes 7, as shown inFIG. 2( c), by inserting (the arrow A) each of the tube-enlargingmandrels 2 by a prescribed depth, the enlargement portion 7 d with aprescribed length is formed. Subsequently, by advancing (the arrow B)the tube-grasping body 3, by the tube-grasping body holder 3 l, from theopening 7 b of the hairpin tube 7, toward the circumferential surface 7e of said enlargement portion 7 d, the tube-grasping body 3 becomesconnected to the exterior of said circumferential surface 7 e, in thestate where said circumferential surface 7 e is surrounded by thetube-contacting parts 3 f.

Afterwards, if the guide-pipe 3 c is moved (the arrow C), by theguide-pipe holder 3 d, in the same direction of the movement of thetube-enlarging mandrel 2, the guide-pipe 3 c presses the slope 3 b whilesliding along the same slope which has been formed on the exteriorsurface of each of said tube-contacting parts 3 f, and which is slantedin the widening direction toward the opening 7 b of the correspondingtube 7. Thus, the diameter of the tube-contacting parts 3 f is reducedin the axial direction of the tube-enlarging mandrel 2, through thespace isolation of the prescribed width 3 u of the slits 3 a. As aresult, each of said tube-contacting parts 3 f becomes to firmly graspand support the circumferential surface 7 e of the enlargement portion 7d of the hairpin tube 7.

Next, from this state, by moving said tube-enlarging mandrel 2 towardthe hairpin part 7 c of the hairpin tube 7, in order to support both ofthe hairpin part 7 c and the opening 7 b of the hairpin tube 7, it ispossible to produce a heat exchanger, still keeping shrinkage of theentire length of hairpin tubes 7 at a minimum.

Also, when the tube-enlarging mandrel 2 is advanced toward the hairpinpart 7 c of the hairpin tube 7 while the circumferential surface 7 e ofthe enlargement portion 7 d is firmly grasped, as explained above, byplural tube-contacting parts 3 f of the tube-grasping body 3, at theside of the opening 7 b of the hairpin tube 7; the enclosing-bodyshifting device 4, equipped with the enclosing-bodies 4 a capable ofenclosing said hairpin part 7 c, is moved back little (not shown in thefigure) in the same direction of the movement of the tube-enlargingmandrel 2, in order to give some tensile strength for the entire hairpintube 7. Thus, It is possible to produce a heat exchanger, keeping theshrinkage of the entire length of the hairpin tube 7 at a minimum, andconsidering the problem of shrinking of the entire length of the hairpintube 7 during the enlarging process, as well as the problem of escapingof the hairpin tube 7 from the tube-contacting parts 3 f and theenclosing-body 4 a. As a result, it is possible to produce a heatexchanger, still keeping the material cost at a minimum.

Thus, it is possible to firmly grasp, by each of the tube-graspingbodies 3 having plural tube-contacting parts 3 f, each of hairpin tubes7 sitting at the interior side in the heat exchanger, as well as each ofthe tubes sitting at the exterior side in the heat exchanger, even forthe following example cases: the case where hairpin tubes 7 are insertedinto the heat radiating fin 6 of a heat exchanger 5 in a zigzag pattern(not shown in the figure); and the case where hairpin tubes 7 areinserted in a zigzag pattern, in multiple columns such as columns of 3,4, or etc. (not shown in the figure) to decrease the gap (the insertpitch) between each of hairpin tubes 7.

Thus, since the tube-contacting parts 3 f of said tube-grasping body 3grasp the circumferential surface 7 e of the enlargement portion 7 d ofthe hairpin tube 7, by decreasing the diameter of the tube-contactingparts 3 f in the axial direction, through the slits which are of aprescribed width 3 u, and which are formed between each of thetube-contacting parts 3 f, even for the case where the diameter of thehairpin tube 7 being enlarged is different according to the spec of theheat exchanger; it is possible to firmly and surely grasp the side ofthe opening 7 b of the hairpin tube 7, by adjusting through the spacedistance of the slits 3 a of a prescribed width 3 u, between each of thetube-contacting parts 3 f, even if there is little difference in each ofdiameters of the tubes. Also, as for the hairpin part 7 c, since thereis no need to replace the hook body 10 with another hook body having analmost identical circular arc to the interior circumference of thehairpin part 7 c, in order to adapt to the different hairpin part 7 c ofhairpin tubes 7 with different diameters; and since it is possible tofirmly and surely grasp by a pair of enclosing-bodies 4 a, withoutaltering the circular arc of the hairpin part 7 c of the hairpin tube 7;it is possible to produce a heat exchanger, performing the enlargingprocess desired, without altering the heat exchanger productionapparatus, even for the following cases: the case where the exteriordiameter (the diameter of the tube, measured considering the circulararc) of the hairpin tube 7 being enlarged is different according to thespec of the heat exchanger 5, and the case where the entire length ofhairpin tubes 7 is somewhat different.

Also, relating to the case where the hairpin part 7 c of the hairpintube 7 is firmly and surely enclosed by a pair of enclosing-bodies 4 aas shown above, it is possible to exchange a pair of enclosing-bodies 4a to other type with a proper opening size, width, and length, accordingto the gap between insert tubes facing each other and the distanceextruded from the terminal side of the heat radiating fin 6 of thehairpin part 7 c of the hairpin 7; even for any of the following examplecases:

-   -   the case where hairpin tubes 7 are inserted into a heat        radiating fin 6 of a heat exchanger 5 in the same zigzag pattern        (not shown in the figure) as above, and    -   the case where hairpin tubes 7 are inserted in a zigzag pattern,        in multiple columns (not shown in the figure) such as columns of        3, 4, or etc. to decrease the gap between each of hairpin tubes        (the insert pitch).        However, unlike the hook body 10 of the prior art, since the        hairpin part is enclosed by a pair of enclosing-bodies 4 a,        there exists some permissible range and it is thus possible to        avoid frequent change of the hook body 10. However, the most        important point is the fact that it is possible to firmly fix        the hairpin part 7 c of each of the hairpin tubes 7 sitting at        the interior side in the heat exchanger, as well as the hairpin        part 7 c of each of the hairpin tubes sitting at the exterior        side in the heat exchanger, by allocating a pair of enclosing        bodies 4 a to each of the hairpin parts 7 c.

Also, even if insert tubes 7 of other types than the hairpin tube areinserted, for example, if multiple straight tubes (not shown in thefigure) are inserted, it is possible to produce a high quality heatexchanger with high precision, by enclosing and supporting, by a pair ofthe enclosing-bodies 4 a, an end of the straight tube extruding from theterminal side of the heat radiating fin 6, and by inserting thetube-enlarging mandrel 2 into the opening 7 b of the other end of thestraight tube, by the same procedure as shown above.

Therefore, even for the case where insert tubes are inserted into a heatradiating fin, in multiple columns such as columns of 3, 4, or etc. todecrease the gap between insert tubes, and the case where the diameterof insert tubes being enlarged is different according to the spec of theheat exchanger, it is possible to firmly grasp and perform the enlargingprocess for insert tubes sitting at the interior side in the heatexchanger, as well as the tubes sitting at the exterior side in the heatexchanger. As a result, it is possible to produce a high quality heatexchanger, still keeping the material cost at a minimum by maintainingshrinkage of total length of insert tubes at a minimum.

Also, as shown in FIG. 2( d), if a bump 3 e is formed at each of thetube-contacting parts 3 f for pressing (the arrow D) the circumferentialsurface 7 e of said enlargement portion 7 d, at the position where eachof the tube-contacting parts meets the enlargement portion 7 d of thehairpin tube 7, in order to build up the extruded-part 7 g extrudingfrom the interior circumferential surface 7 f of said hairpin 7, in theaxial direction of the tube-enlarging mandrel 2; it is possible tosurely set the reference location of the opening 7 b during theenlargement process, and therefore, it is possible to produce a highprecision heat exchanger by the enlarging process with higher precision.

On the other hand, the method, which is very similar to the JapanesePatent 10-85878, and which still considers the situation explained inFIG. 2( d) above, is Japanese Patent 9-99334 (hereinafter referred to as‘Patent Document 3’) wherein a slope is formed in front of the bumpwhich is formed at each of the tube-contacting parts, in order toprevent said opening from being deformed by a collision with theopening; a slope is formed in front of the guide pipe, for reducing thesliding abrasion against the slope on the exterior surface of each ofsaid tube-contacting parts; a bolt is formed on the exteriorcircumferential surface of the tube-contacting part, a nut is formed onthe interior circumferential surface of the guide-pipe, and saidguide-pipe is screwed by said bolt and nut and installed for moving saidguide-pipe back and forth.

SUMMARY OF THE INVENTION

The current invention resolves the problems explained below.

That is, according to the heat exchanger production apparatus 1configured as above, since

-   -   the tube-enlarging mandrel 2 is connected from its exterior to        the tube-grasping body 3 to enable to move the tube-grasping        body along the tube-enlarging mandrel 2;

said tube-grasping body 3 is equipped with a plurality oftube-contacting parts 3 f on which the slopes 3 b are formed and slantedin the widening direction, toward the side of the opening 7 b of thecorresponding tube 7, and which are capable of radially expanding oraxially compressing (the arrow E) in the cross direction of thelongitudinal length of said hairpin tube 7;

-   -   said slope 3 b is formed to reach the end-line 3 o of the        tube-contacting part 3 f;    -   said tube-grasping body 3 is screwed and connected to the        tube-grasping body holder 3 l by the bolt 3 k formed at the        other side, the opposite side of said tube-contacting parts 3 f.        Said tube-grasping body holder 3 l is capable of moving back and        forth (the arrow F) by a sliding means such as a cylinder (not        shown in the figure), in the longitudinal direction of the        hairpin tube 7, within a prescribed pitch; and    -   the guide-pipe 3 c is also screwed and connected to the        guide-pipe holder 3 d by the bolt 3 h formed at the other side.        Said guide-pipe holder 3 d is capable of moving back and forth        (the arrow G) by a sliding means such as a cylinder (not shown        in the figure);        by sliding said guide-pipe 3 c toward the opening 7 b of the        tube 7 along the slopes 3 b of the tube-contacting parts 3 f,        the diameter of the tube-contacting parts 3 f is reduced in the        axial direction. At the same time, the bump 3 e, which is formed        at the side of the opening 7 b on the interior surface of each        of the tube-contacting parts 3 f, presses the circumferential        surface 7 e of the enlargement portion 7 d of the hairpin tube        7, in order to form an extruded-part 7 g extruding in the axial        direction of the tube 7. Thus, the tube-contacting parts become        to firmly grasp and support the tube, and, therefore, it is        possible to accurately set the reference point of the opening 7        b, during the enlarging process, such that producing a high        precision heat exchanger is possible by the higher precision        enlarging process. However, since, in the tube-grasping body 3        configured as above, the slope 3 b of each of the        tube-contacting parts 3 f is formed to reach the end-line 3 o of        each of the tube-contacting parts 3 f, it is necessary to        advance said guide-pipe 3 c, while sliding along the slopes 3 b,        to the position where the end-line of the guide-pipe 3 c        contacts the end-line 3 o of the tube-contacting part 3 f.

Recently, there exists a trend of downsizing, not only the heatexchanger 5 itself (tubes being downsized and etc.), but also straighttubes or hairpin tubes 7 being inserted into the heat radiating fin 6 ofsaid heat exchanger 5, due to the problems of saving in energy and cost.Therefore, it is needed to have a heat exchanger 5 with a smaller gapbetween each of tubes 7 than the prior arts, for the following examplecases: the case where straight tubes or hairpin tubes 7 are inserted ina row (not shown in the figure) into the heat radiating fin 6 of theheat exchanger 5, the case where tubes 7 are inserted in a zigzagpattern (not shown in the figure), and the case where tubes 7 areinserted in multiple columns such as columns of 3, 4, or etc (not shownin the figure).

On the other hand, according to the heat exchanger production apparatus1 configured as above, even if the diameter of the hairpin tube 7 of theheat exchanger 5 being enlarged is different according to the spec ofthe heat exchanger 5, since the circumferential surface 7 e of theenlargement portion 7 d of the hairpin tube 7 is grasped by each of thetube-contacting parts 3 f of the tube-grasping body 3, by adjusting,within some range, the space distance of a prescribed width 3 u of eachof the slits 3 a which are formed between each of the tube-contactingparts; it is possible to firmly and surely grasp the side of the opening7 b of the hairpin tube 7, by automatically adapting to the differencein tube diameter through the slits between each of the tube-contactingparts 3 f. However, unfortunately, according to the tube-grasping body 3of the prior art, since the slope 3 b of each of the tube-contactingparts 3 f is formed to reach the end-line 3 o of each of thetube-contacting parts 3 f, it is necessary to advance the end-line ofthe guide-pipe 3 c to the end-line 3 o of the tube-contacting part 3 f,during shrinking of the diameter of the tube-contacting parts 3 f of thetube-grasping body 3. Thus, if both of exterior diameters of thetube-contacting parts 3 f and the tube-grasping body 3 are minimized,the exterior diameter of the guide-pipe 3 c being connected at theexterior of the tube-grasping body 3 is automatically determined as thereference diameter (the interior diameter itself when viewed from theguide-pipe 3 c), the exterior diameter measured between summits of theopposing slopes 3 b which are faced each other, and which are formed toreach the end-line 3 o of the corresponding tube-contacting parts whosediameter is being decreased during the enlargement. Thus, there is aproblem in the exterior diameter of each of the guide-pipes 3 c, inorder to allocate to each of straight tubes or hairpin tubes 7, when thegap between the tubes is significantly reduced. As a result, due theproblem of contacting neighboring guide-pipes 3 c, there exists aproblem of developing a limit in the gap (pitch) between each of thetube-grasping bodies 3, in allocating each of straight tubes or hairpintubes 7 to a tube-grasping body 3 which is connected at its exterior toguide-pipe 3 c.

Also, according to PATENT DOCUMENT 3 of the prior arts, a bolt is formedon the exterior circumferential surface of the tube-contacting part, anda nut is formed on the interior circumferential surface of theguide-pipe, in order to join them together and move said guide-pipe backand forth. However, if the gap between each of straight tubes or hairpintubes 7 being inserted into said heat radiating fin 6 is significantlyreduced comparing to the prior arts, there exists the same problem asabove, such a problem as a limit in the gap between each of thetube-grasping bodies 3, due to the problems such as the height of thethreads of the bolt and nut or the gap (pitch) between screws. Thus, toresolve problems such as the cost and the configuration for any of casesabove, it is requested the development of a tube-grasping body 3 or aheat exchanger production apparatus utilizing said tube-grasping body 3,wherein

-   -   said tube-grasping body 3 is simply configured to slide back and        forth, toward the opening 7 b, in order to radially expand or        axially compress said tube-contacting parts 3 f of the        tube-grasping body 3; and    -   said tube-grasping body 3 is able to significantly reduce the        gap (pitch), still avoiding the contact with neighboring        guide-pipes 3 c, even when the gap between each of straight        tubes or hairpin tubes 7 being inserted into the heat radiating        fin 6 is significantly reduced.

Also, not limiting to the case where the gap between each of straighttubes or hairpin tubes 7 being inserted into the heat radiating fin 6 issignificantly reduced comparing to the prior arts, for example, if theexterior diameter of the enlargement portion of the tube is smaller thanthe interior diameter of the tube-grasping body 3 or the interiordiameter between tube-contacting parts 3 f of said tube-grasping body 3,it is possible for the tube-grasping body 3 or the tube-contacting parts3 f to grasp the exterior circumferential surface 7 e of the enlargementportion 7 d of each of straight tubes or hairpin tubes 7. However, ifthe exterior diameter of the enlargement portion 7 d of the tube 7 isabout the same size as the interior diameter of the tube-grasping body 3or the interior diameter between the tube-contacting parts 3 f of saidtube-grasping body 3 (the interior diameter between the bumps 3 e ifbumps 3 e are formed), or if the axis of said enlargement portion 7 d isaway, by some degree, relative to the longitudinal direction of thetube-enlarging mandrel 2, from the axis of the tube-grasping body 3,there develops a case where the end-line 3 o of each of thetube-contacting parts 3 f contacts the opening 7 b of the tube such thatat least one of them is damaged. Thus, an improvement is required.

The current invention provides a tube-grasping body for grasping aninsert tube in a heat exchanger, heat exchanger production methods andapparatuses utilizing the tube-grasping body, and an air conditionerand/or an outdoor unit equipped with the heat exchanger produced by themethods and apparatuses; in order to produce a heat exchanger whereinthe total length of the insert tubes is kept at an almost same leveleven after the enlargement, still satisfying the following requirements:

-   -   preventing one end from being transformed or deformed by        collision of the end-line of the tube-contacting parts of the        tube-grasping body, with the opening of the tube where the        enlargement portion is formed;    -   preventing a contact with neighboring guide-pipes, when        allocating a tube-grasping body being connected at its exterior        to the guide-pipe, to each of straight tubes or hairpin tubes;        and    -   firmly supporting the enlargement portion of each of the tubes        sitting at the interior side in the heat exchanger, as well as        that of each of the tubes sitting at the exterior side in the        heat exchanger, in the following heat exchangers:        -   a downsized heat exchanger where the gap (pitch) between            each of the tube-grasping bodies is minimized, and        -   a heat exchanger where the gap between each of the tubes is            significantly reduced;            to resolve all the problems occurring in the following            example cases:    -   the case where the gap between straight tubes or hairpin tubes        is decreased, due to downsized insert tubes due to savings in        energy or cost (use of downsized tubes or downsized heat        exchanger itself);    -   the case where the gap between insert tubes is decreased due to        insertion of straight tubes or hairpin tubes into a heat        radiating fin in a zigzag pattern;    -   the case where the gap between insert tubes is decreased to        enable them to be inserted into a heat radiating fin in multiple        columns such as columns of 3, 4, or etc.;    -   the case where the diameters of insert tubes being enlarged are        different according to the spec of the heat exchanger;    -   the case where the gap between each of straight tubes or hairpin        tubes being inserted into said heat radiating fin is        significantly decreased comparing to the prior arts;    -   the case where the exterior diameter of the enlargement portion        of the insert tube becomes about the same size as the interior        diameter of the tube-grasping body itself or the interior        diameter between the tube-contacting parts (the interior        diameter between the bumps if bumps are formed on the interior        surface of the tube-contacting parts); and    -   the case where the axis of said enlargement portion is away, by        some degree, relative to the direction of the longitudinal        length of the tube-enlarging mandrel, from the axis of the        tube-grasping body.

The present invention provides the ways to resolve the problemsexplained above. That is, the invention in claim 1 is to provide atube-grasping body for grasping an insert tube in a heat exchanger,

-   -   which is used in a heat exchanger production apparatus 1;    -   which is also connectable at the exterior of a tube-enlarging        mandrel 2, for moving back and forth, along said tube-enlarging        mandrel 2 which is penetrable from the opening 7 b of a tube 7        inserted into a heat radiating fin 6 of a heat exchanger 5;    -   which is also equipped with a plurality of tube-contacting parts        3 f, capable of radially expanding or axially compressing in the        cross direction of the longitudinal length of said tube 7;    -   which is also equipped with slopes 3 b slanting gradually in the        widening direction toward the opening 7 b of the corresponding        tube, wherein each of the slopes 3 b is formed on the exterior        surface of each of said tube-contacting parts 3 f;    -   which also radially expands or axially compresses each of said        tube-contacting parts 3 f, by a sliding means which moves back        and forth in the longitudinal direction of the tube, along said        slopes 3 b of the tube-contacting parts 3 f; and    -   which is also characterized by the configuration wherein        -   said tube-contacting parts 3 f, capable of radially            expanding or axially compressing, are formed and separated            by a plurality of slits 3 a which are of prescribed widths 3            u, and which are formed in the longitudinal direction of the            tube-grasping body 3, the same direction of the movement of            the tube-enlarging mandrel 2; and        -   the width of each of said slits 3 a is gradually increased            from said prescribed width 3 u to an expanded width 3 x,            from a prescribed location toward the opening 7 b of said            tube 7.

The invention in claim 2 is to provide the tube-grasping body forgrasping an insert tube in a heat exchanger, wherein

-   -   a sliding means is provided by the guide-pipe 3 c, which moves        back and forth in the longitudinal direction of the tube, along        said slopes 3 b of the tube-contacting parts 3 f; and    -   the maximum exterior diameter 3 v of said tube-grasping body 3        is set below the exterior diameter 3 w of the guide-pipe 3 c,        wherein the maximum exterior diameter 3 v is formed and        configured by the opposing tube-contacting parts 3 f facing each        other in order to build up said slopes 3 b.

The invention in claim 3 is to provide the tube-grasping body forgrasping an insert tube in a heat exchanger, wherein

-   -   each of said tube-contacting parts 3 f, capable of radially        expanding or axially compressing, is bent to form a smooth curve        with or without a edge on the bent portion, in the radial        direction, from a prescribed location of each of said slits 3 a        toward the opening 7 b of the tube 7, in order to gradually        expand the width of each of said slits 3 a from the prescribed        width 3 u to the expanded width 3 x, from a prescribed location,        toward the opening 7 b of the tube 7.

The invention in claim 4 is to provide the tube-grasping body forgrasping an insert tube in a heat exchanger, wherein

-   -   a bump 3 e is formed to extrude from the interior surface of        each of said tube-contacting parts 3 f, at the side of the        opening 7 b, in the axial direction of the tube 7; and    -   a slope 3 m, which has a straight or curved sloping side, is        formed at said bump 3 e, and slanted in the widening direction,        from the summit 3 p of the bump 3 e, toward the opening 7 b of        the tube 7 facing the end-line 3 o of the tube-contacting part 3        f, in order to prevent said opening 7 b from being deformed by        collision of the bump 3 e with the opening 7 b of the tube 7        when the opening 7 b of the tube 7 is connected at its exterior        to the tube-contacting parts 3 f.

The invention in claim 5 is to provide the tube-grasping body forgrasping an insert tube in a heat exchanger, wherein

-   -   a limiting means is installed at said tube-grasping body 3        having tube-contacting parts 3 f when said tube-grasping body 3        is held by the tube-grasping body holder 3 l, in order to limit        the location of the radial expansion or the axial compression of        the tube-contacting parts 3 f of the tube-grasping body 3        (limiting rotation of the tube-grasping body holder 3 l).

The invention in claim 6 is to provide the tube-grasping body forgrasping an insert tube in a heat exchanger, wherein

-   -   a slope 3 g, which has a straight or curved sloping side, is        formed on the interior circumference of said guide-pipe 3 c at        its end side, and slanted in the widening direction toward the        opening 7 b of the corresponding tube 7, in order to reduce the        sliding abrasion against each of the slopes 3 b formed on the        exterior surface of each of said tube-contacting parts 3 f; and    -   said slope 3 b is also formed, on the exterior surface of each        of the tube-contacting parts 3 f of said tube-grasping body 3,        at such a position that the slope 3 b is not allowed to reach        the end-line 3 o of each of said tube-contacting parts 3 f.

The invention in claim 7 is to provide a heat exchanger productionmethod, utilizing a tube-grasping body for grasping an insert tube in aheat exchanger, the method comprising:

-   -   the first process wherein        -   an enlargement portion having a prescribed length is formed,            by inserting a tube-enlarging mandrel by a prescribed depth,            from the opening of an insert tube being inserted into a            heat radiating fin of a heat exchanger;    -   the second process wherein        -   the exterior of said enlargement portion is surrounded and            connected, by the tube-grasping body wherein            -   said tube-contacting parts, capable of radially                expanding or axially compressing, are formed and                separated by a plurality of slits which are of                prescribed widths, and which are formed in the                longitudinal direction of the tube-grasping body, the                same direction of the movement of the tube-enlarging                mandrel; and            -   the width of each of said slits is gradually increased                from said prescribed width to an expanded width, from a                prescribed location toward the opening of said tube;    -   the third process wherein        -   the circumferential surface of the enlargement portion of            the tube is firmly grasped and supported by tube-contacting            parts, as the diameter of each of the tube-contacting parts            is reduced in the axial direction to gradually reduce the            expanded width which has been expanded from a prescribed            width from a prescribed position of the slit, by a sliding            means pressing the slopes of the tube-contacting parts,            while sliding, toward the opening of the corresponding tube,            along the same slopes which are slanted in the widening            direction toward the opening of the tube; and    -   the forth process wherein,        -   in the state where the circumferential surface of the            enlargement portion of the tube is firmly grasped and            supported by the tube-contacting parts, the tube-enlarging            mandrel is further inserted into the tube to join the heat            radiating fin and the tube together.

The invention in claim 8 is to provide a heat exchanger productionmethod, utilizing said tube-grasping body for grasping an insert tube ina heat exchanger, wherein

-   -   a bump is formed to extrude from the interior surface of each of        said tube-contacting parts, at the side of the opening, in the        axial direction of the tube; and    -   each of said tube-contacting parts, capable of radially        expanding or axially compressing, is bent to form a smooth curve        with or without a edge on the bent portion, in the radial        direction, from a prescribed location of said slit toward the        opening of the tube, in order to gradually expand the width of        each of said slits from the prescribed width to the expanded        width, from a prescribed location, toward the opening of the        tube.

The invention in claim 9 is to provide a heat exchanger productionmethod, utilizing said tube-grasping body for grasping an insert tube ina heat exchanger, wherein

-   -   a limiting means is installed at said tube-grasping body 3        having tube-contacting parts 3 f when said tube-grasping body 3        is held by the tube-grasping body holder 3 l, in order to limit        the location of the radial expansion or the axial compression of        the tube-contacting parts 3 f of the tube-grasping body 3.

The invention in claim 10 is to provide a heat exchanger productionmethod, utilizing said tube-grasping body for grasping an insert tube ina heat exchanger, wherein

-   -   a sliding means is provided by the guide-pipe 3 c, which moves        back and forth in the longitudinal direction of the tube, along        said slopes 3 b of the tube-contacting parts 3 f; and    -   the maximum exterior diameter 3 v of said tube-grasping body 3        is set below the exterior diameter 3 w of the guide-pipe 3 c,        wherein the maximum exterior diameter 3 v is formed and        configured by the opposing tube-contacting parts 3 f facing each        other in order to build up said slopes 3 b.

The invention in claim 11 is to provide an air-conditioner which isequipped with a heat exchanger produced by a production method,utilizing said tube-grasping body for grasping an insert tube in a heatexchanger.

The invention in claim 12 is to provide an outdoor unit which is usedwith an air conditioner, and which is equipped with a heat exchangerproduced by a production method, utilizing said tube-grasping body forgrasping an insert tube in a heat exchanger.

The invention in claim 13 is to provide a heat exchanger productionapparatus wherein

-   -   the tube-grasping body is used in a heat exchanger production        apparatus 1;    -   the tube-grasping body is also connectable at the exterior of a        tube-enlarging mandrel 2, for moving back and forth, along said        tube-enlarging mandrel 2 which is penetrable from the opening 7        b of a tube 7 inserted into a heat radiating fin 6 of a heat        exchanger 5;    -   the tube-grasping body is also equipped with a plurality of        tube-contacting parts 3 f, capable of radially expanding or        axially compressing in the cross direction of the longitudinal        length of said tube 7;    -   the tube-grasping body is also equipped with slopes 3 b slanting        gradually in the widening direction toward the opening 7 b of        the corresponding tube, wherein each of the slopes 3 b is formed        on the exterior surface of each of said tube-contacting parts 3        f;    -   the tube-grasping body is also equipped with a sliding means        which radially expands or axially compresses each of said        tube-contacting parts 3 f, by sliding back and forth in the        longitudinal direction of the tube, along said slopes 3 b of the        tube-contacting parts 3 f;    -   a bump 3 e is formed to extrude from the interior surface of        each of said tube-contacting parts 3 f, at the side of the        opening 7 b, in the axial direction of the tube 7;    -   a slope 3 m, which has a straight or curved sloping side, is        formed at said bump 3 e, and slanted in the widening direction,        from the summit 3 p of the bump 3 e, toward the opening 7 b of        the tube 7 facing the end-line 3 o of the tube-contacting part 3        f, in order to prevent said opening 7 b from being deformed by        collision of the bump 3 e with the opening 7 b of the tube 7        when the opening 7 b of the tube 7 is connected at its exterior        to the tube-contacting parts 3 f;    -   a slope 3 g, which has a straight or curved sloping side, is        formed on the interior circumference of said guide-pipe 3 c at        its end side, and slanted in the widening direction toward the        opening 7 b of the corresponding tube 7, in order to reduce the        sliding abrasion against each of the slopes 3 b formed on the        exterior surface of each of said tube-contacting parts 3 f;    -   said slope 3 b is also formed, on the exterior surface of each        of the tube-contacting parts 3 f of said tube-grasping body 3,        at such a position that the slope 3 b is not allowed to reach        the end-line 3 o of each of said tube-contacting parts 3 f; and    -   the tube-grasping body 3 is also characterized by the        configuration wherein        -   said tube-contacting parts 3 f, capable of radially            expanding or axially compressing, are formed and separated            by a plurality of slits 3 a which are of prescribed widths 3            u, and which are formed in the longitudinal direction of the            tube-grasping body 3, the same direction of the movement of            the tube-enlarging mandrel 2; and        -   the width of each of said slits 3 a is gradually increased            from said prescribed width 3 u to an expanded width 3 x,            from a prescribed location toward the opening 7 b of said            tube 7.

The invention in claim 14 is to provide a heat exchanger productionapparatus 1, utilizing said tube-grasping body 3, wherein,

-   -   the slope 3 b is formed on the exterior surface of each of said        tube-contacting parts 3 f of said tube-grasping body 3, at the        rear side of the bump 3 e which is formed at the side of the        opening 7 b on the interior surface of each of said        tube-contacting parts 3 f, the opposite side of the end-line 3 o        of the tube-contacting part 3 f, in such a way that said slope 3        b is not allowed to reach the end-line 3 o of each of the        tube-contacting parts 3 f of said tube-grasping body 3.

The invention in claim 15 is to provide a heat exchanger productionapparatus 1, utilizing said tube-grasping body 3, wherein

-   -   said tube-grasping body 3 is equipped with a tool-joining part 3        j for joining or disjoining said tube-grasping body 3, to or        from the tube-grasping body holder 3 l.

The invention in claim 16 is to provide a heat exchanger productionapparatus 1, utilizing said tube-grasping body 3, wherein

-   -   a limiting means is installed at said tube-grasping body with        tube-contacting parts 3 f when said tube-grasping body 3 is held        by the tube-grasping body holder 3 l, in order to limit the        location of the radial expansion or the axial compression of the        tube-contacting parts 3 f of the tube-grasping body 3 (limiting        rotation of the tube-grasping body holder 3 l).

The invention in claim 17 is to provide a heat exchanger productionapparatus 1, utilizing said tube-grasping body 3, wherein

-   -   said sliding means is provided by the guide-pipe 3 c, and    -   said guide-pipe 3 c is equipped with a tool-joining part 3 i for        joining or disjoining the guide-pipe 3 c, to or from the        guide-pipe holder 3 d.

According to the current invention, as the tube-grasping body forgrasping an insert tube in a heat exchanger,

-   -   which is used in a heat exchanger production apparatus 1;    -   which is also connectable at the exterior of a tube-enlarging        mandrel 2, for moving back and forth, along said tube-enlarging        mandrel 2 which is penetrable from the opening 7 b of a tube 7        inserted into a heat radiating fin 6 of a heat exchanger 5;    -   which is also equipped with a plurality of tube-contacting parts        3 f, capable of radially expanding or axially compressing in the        cross direction of the longitudinal length of said tube 7;    -   which is also equipped with slopes 3 b slanting gradually in the        widening direction toward the opening 7 b of the corresponding        tube, wherein each of the slopes 3 b is formed on the exterior        surface of each of said tube-contacting parts 3 f; and    -   which also radially expands or axially compresses each of said        tube-contacting parts 3 f, by a sliding means which moves back        and forth in the longitudinal direction of the tube, along said        slopes 3 b of the tube-contacting parts 3 f;        since    -   said tube-contacting parts 3 f, capable of radially expanding or        axially compressing, are formed and separated by a plurality of        slits 3 a which are of prescribed widths 3 u, and which are        formed in the longitudinal direction of the tube-grasping body        3, the same direction of the movement of the tube-enlarging        mandrel 2; and    -   the width of each of said slits 3 a is gradually increased from        said prescribed width 3 u to an expanded width 3 x, from a        prescribed location toward the opening 7 b of said tube 7;        when the side of the opening 7 b of the tube 7 is being        connected at its exterior to the tube-contacting parts 3 f, it        is possible to expand the maximum open diameter 3 y and the        dynamic range of each of the tube-contacting parts 3 f, (said        dynamic range is measured from the difference in diameters        between the expansion and the compression states), through the        plural slits 3 a which are separated by a prescribed width 3 u,        and which are formed in the longitudinal direction of the        tube-grasping body 3 to set up said tube-contacting parts 3 f.        Therefore, even if the exterior diameter 7 i of the enlargement        portion 7 d at the side of the opening 7 b of the tube 7 becomes        about the same size as the interior diameter of the        tube-grasping body 3 itself or the interior diameter between the        tube-contacting parts 3 f (the interior diameter between the        bumps, if bumps are formed), or, even if the axis of the        enlargement portion 7 d is away, by a small degree, relative to        the longitudinal direction of the tube-enlarging mandrel, from        the axis of the tube-grasping body 3, it is possible, by each of        the tube-contacting parts 3 f whose maximum open diameter 3 y        and the dynamic range have been expanded, to provide the effect        of surely preventing one end from being deformed or transformed        by a collision of the end-line of the tube-contacting part 3 f        and the opening 7 b of the tube 7.

Also, according to the tube-grasping body 3 of the current invention,since

-   -   a sliding means is provided by the guide-pipe 3 c, which moves        back and forth in the longitudinal direction of the tube, along        said slopes 3 b of the tube-contacting parts 3 f; and    -   the maximum exterior diameter 3 v of said tube-grasping body 3        is set below the exterior diameter 3 w of the guide-pipe 3 c,        wherein the maximum exterior diameter 3 v is formed and        configured by the opposing tube-contacting parts 3 f facing each        other in order to build up said slopes 3 b,        it is possible to accommodate said tube-contacting parts 3 f,        which are formed and separated by the slits 3 a with a        prescribed width 3 u, within the exterior diameter 3 w of the        guide-pipe 3 c, in the state where the maximum open diameter 3 y        and the dynamic range (the dynamic range is the difference of        the diameters between the expansion and compression states) of        each of the tube-contacting parts 3 f have been expanded through        expansion of each of the widths of the slits 3 a to a larger        value than a prescribed width 3 u. Therefore, it is possible to        provide the effect of surely preventing a collision by        neighboring tube-contacting parts 3 f, even for the following        cases:    -   the case where the space between each of the guide-pipes 3 c is        fully taken up, corresponding to the case where the gap between        branches of the hairpin tube 7, or the gap between each of        neighboring hairpin tubes 7, or the gap between each of straight        tubes being inserted, is significantly reduced comparing to the        prior arts, and    -   the case where the enlargement portion 7 d at the side of the        opening 7 b of the tube 7 is being grasped, by each of the        tube-contacting parts 3 f of each of the tube-grasping bodies 3,        which is accommodated in the interior of each of the neighboring        guide-pipes 3 c.

Also, according to the tube-grasping body 3 of the current invention,since

-   -   each of said tube-contacting parts 3 f, capable of radially        expanding or axially compressing, is bent to form a smooth curve        with or without a edge on the bent portion, in the radial        direction, from a prescribed location of each of said slits 3 a        toward the opening 7 b of the tube 7, in order to gradually        expand the width of each of said slits 3 a from the prescribed        width 3 u to the expanded width 3 x, from a prescribed location,        toward the opening 7 b of the tube 7,        it is possible to increase durability as a component, by        smoothly sliding the guide-pipe 3 c along the slope 3 b which is        formed on each of the tube-contacting parts 3 f with or without        a edge on its sloping side, even if the maximum open diameter 3        y and the dynamic range of each of the tube-contacting parts 3 f        (said dynamic range is the difference in diameters between the        expansion and the compression states of each of the        tube-contacting parts 3 f) are expanded, through the space        distance of the expanded widths 3 x, the width expanded from the        prescribed width 3 u of the slit 3 a. Also, it is possible to        provide the effect of easily and firmly adjusting to maximize        the dynamic range of each of the tube-contacting parts 3 f, from        the maximum open diameter 3 y to the minimum diameter (till the        so-called grasping operation, though the shrinkage in the axial        direction in each of the tube-contacting parts 3 f is different,        according to the exterior diameter of the enlargement portion of        the tube), in proportion to the sliding distance of the        guide-pipe 3 c.

Also, according to the tube-grasping body 3 of the current invention,since

-   -   a bump 3 e is formed to extrude from the interior surface of        each of said tube-contacting parts 3 f, at the side of the        opening 7 b, in the axial direction of the tube 7; and    -   a slope 3 m, which has a straight or curved sloping side, is        formed at said bump 3 e, and slanted in the widening direction,        from the summit 3 p of the bump 3 e, toward the opening 7 b of        the tube 7 facing the end-line 3 o of the tube-contacting part 3        f, in order to prevent said opening 7 b from being deformed by        collision of the bump 3 e with the opening 7 b of the tube 7        when the opening 7 b of the tube 7 is connected at its exterior        to the tube-contacting parts 3 f,        even if the opening 7 b of the tube 7 contacts the bump 3 e of        the tube-contacting part, it is possible to enable the bump 3 e        to slide smoothly following the opening 7 b of the tube 7, by        the slope 3 m with the sloping side being straight or curved,        and it is also possible to provide the effect of surely        preventing the opening 7 b of the tube 7 and the tube-contacting        parts 3 f having the bump 3 e, from being deformed or        transformed.

Also, according to the tube-grasping body of the current invention,since

-   -   a limiting means is installed at said tube-grasping body 3        having tube-contacting parts 3 f when said tube-grasping body 3        is held by the tube-grasping body holder 3 l, in order to limit        the location of the radial expansion or the axial compression of        the tube-contacting parts 3 f of the tube-grasping body 3,        for example, even if the gap between each of the end-plates (not        shown in the figure) which is installed near the enlargement        portion 7 d of the tube 7 being inserted into the heat radiating        fin 6 in a heat exchanger 5, or the gap between each of the        neighboring insert tubes 7, is reduced, it is possible to        support and keep the tube-grasping body 3 at such a place that        any one of the tube-grasping body holders 3 l is not allowed to        rotate to contact the tube-contacting parts 3 f of neighboring        tube-grasping bodies 3, when each of the tube-contacting parts 3        f of the tube-grasping body 3 is radially increased in its        diameter. As a result, it is possible to provide the effect of        surely avoiding deformation by collision of each of the        tube-contacting parts 3 f of the neighboring tube-grasping        bodies 3, or deformation of said end-plate of the heat exchanger        5 by said tube-contacting parts 3 f.

Also, according to said guide-pipe 3 c and the tube-grasping body 3 ofthe current invention, since

-   -   a slope 3 g, which has a straight or curved sloping side, is        formed on the interior circumference of said guide-pipe 3 c at        its end side, and slanted in the widening direction toward the        opening 7 b of the corresponding tube 7, in order to reduce the        sliding abrasion against each of the slopes 3 b formed on the        exterior surface of each of said tube-contacting parts 3 f; and    -   said slope 3 b is also formed, on the exterior surface of each        of the tube-contacting parts 3 f of said tube-grasping body 3,        at such a position that the slope 3 b is not allowed to reach        the end-line 3 o of each of said tube-contacting parts 3 f,        under the condition where the gap between branches of the        hairpin tube or the gap between the neighboring hairpin tubes is        significantly reduced comparing to the prior arts, shrinking of        the diameter of each of the tube-contacting parts 3 f, which is        caused by the movement of the guide-pipe 3 c toward the opening        7 b, can be stopped before said guide-pipe 3 c reaches the        end-line 3 o of the tube-contacting parts 3 f during the        shrinking operation of the diameter in each of the        tube-contacting parts 3 f. Thus, when the exterior diameter 3 q        of the guide-pipe 3 c, which is being connected at the exterior        of the tube-grasping body 3 having the tube-contacting parts 3        f, is determined as the reference diameter (the interior        diameter 3 r of the guide-pipe 3 c when viewed from itself), the        exterior diameter 3 n measured between the summits of the slopes        3 b of the opposing tube-contacting parts 3 f which are faced        each other, and whose diameter is being reduced during the        enlargement through the slits 3 a, it is possible to set the        enlargement-occurring point 3 s, where the diameter of the        tube-contacting parts 3 f becomes to be the exterior diameter 3        n during the compression in the diameter of the tube-contacting        parts 3 f, at the location 3 t, the location shifted from the        end-line 3 o of said tube-contacting parts 3 f toward the side        of the opening 7 b, the opposite side of said end-line 3 o of        the tube-contacting part 3 f. Thus, it is possible to decrease        the interior diameter 3 r of the guide-tube 3 c by the distance        shifted. As a result, the exterior diameter 3 q of the        guide-pipe 3 c is automatically reduced. Also, even if the gap        between branches of the hairpin tube 7, the gap between each of        the neighboring hairpin tubes 7, or the gap between each of the        straight insert tubes is significantly reduced comparing to the        prior arts, it is possible to prevent the guide-pipe 3 c whose        diameter 3 q has been decreased, from being hit by each of the        neighboring guide-pipes 3 c, when the opening 7 b of each of        straight tubes or hairpin tubes is being connected at its        exterior by the tube-contacting parts of the tube-grasping body        3 equipped with said guide-pipe 3 c. Thus, it is possible to        provide an effect of well producing the heat exchanger 5,        wherein the gap between insert tubes is significantly reduced        for the following example cases: the case where the heat        exchanger is downsized (downsized insert pipes, etc.) due to        reasons of saving in energy or cost, the case where straight        tubes or hairpin tubes 7 are inserted in a zigzag pattern, and        the case where straight tubes or hairpin tubes are inserted in        multiple columns such as columns of 3, 4, or etc.

Also, according to the heat exchanger production apparatus 1 of thecurrent invention, as the apparatus wherein

-   -   the tube-grasping body is also connectable at the exterior of a        tube-enlarging mandrel 2, for moving back and forth, along said        tube-enlarging mandrel 2 which is penetrable from the opening 7        b of a tube 7 inserted into a heat radiating fin 6 of a heat        exchanger 5;    -   the tube-grasping body is also equipped with a plurality of        tube-contacting parts 3 f, capable of radially expanding or        axially compressing in the cross direction of the longitudinal        length of said tube 7;    -   the tube-grasping body is also equipped with slopes 3 b slanting        gradually in the widening direction toward the opening 7 b of        the corresponding tube, wherein each of the slopes 3 b is formed        on the exterior surface of each of said tube-contacting parts 3        f;    -   the tube-grasping body is also equipped with a sliding means        which radially expands or axially compresses each of said        tube-contacting parts 3 f, by sliding back and forth in the        longitudinal direction of the tube, along said slopes 3 b of the        tube-contacting parts 3 f;    -   a bump 3 e is formed to extrude from the interior surface of        each of said tube-contacting parts 3 f, at the side of the        opening 7 b, in the axial direction of the tube 7;    -   a slope 3 m, which has a straight or curved sloping side, is        formed at said bump 3 e, and slanted in the widening direction,        from the summit 3 p of the bump 3 e, toward the opening 7 b of        the tube 7 facing the end-line 3 o of the tube-contacting part 3        f, in order to prevent said opening 7 b from being deformed by        collision of the bump 3 e with the opening 7 b of the tube 7        when the opening 7 b of the tube 7 is connected at its exterior        to the tube-contacting parts 3 f;    -   a slope 3 g, which has a straight or curved sloping side, is        formed on the interior circumference of said guide-pipe 3 c at        its end side, and slanted in the widening direction toward the        opening 7 b of the corresponding tube 7, in order to reduce the        sliding abrasion against each of the slopes 3 b formed on the        exterior surface of each of said tube-contacting parts 3 f; and    -   said slope 3 b is also formed, on the exterior surface of each        of the tube-contacting parts 3 f of said tube-grasping body 3,        at such a position that the slope 3 b is not allowed to reach        the end-line 3 o of each of said tube-contacting parts 3 f;        since    -   said tube-contacting parts 3 f, capable of radially expanding or        axially compressing, are formed and separated by a plurality of        slits 3 a which are of prescribed widths 3 u, and which are        formed in the longitudinal direction of the tube-grasping body        3, the same direction of the movement of the tube-enlarging        mandrel 2; and    -   the width of each of said slits 3 a is gradually increased from        said prescribed width 3 u to an expanded width 3 x, from a        prescribed location toward the opening 7 b of said tube 7;        when the side of the opening 7 b of the tube 7 is being        connected at its exterior to the tube-contacting parts 3 f, it        is possible to expand the maximum open diameter 3 y and the        dynamic range of each of the tube-contacting parts 3 f (said        dynamic range is measured from the difference in diameters        between the expansion and the compression states), through the        plural slits 3 a which are separated by a prescribed width 3 u,        and which are formed in the longitudinal direction of the        tube-grasping body 3 to set up said tube-contacting parts 3 f.        Therefore, even if the exterior diameter 7 i of the enlargement        portion 7 d at the side of the opening 7 b of the tube 7 becomes        about the same size as the interior diameter of the        tube-grasping body 3 itself or the interior diameter between the        tube-contacting parts 3 f (the interior diameter between the        bumps, if bumps are formed), or, if the axis of the enlargement        portion 7 d is away, by a small degree, relative to the        longitudinal direction of the tube-enlarging mandrel, from the        axis of the tube-grasping body 3, it is possible, by each of the        tube-contacting parts 3 f whose maximum open diameter 3 y and        the dynamic range have been expanded, to provide the effect of        surely preventing one end from being deformed or transformed by        collision of the end-line of the tube-contacting part 3 f and        the opening 7 b of the tube 7.

According to the current invention, in the heat exchanger productionapparatus 1 configured as above, even if the diameter of hairpin tubes 7in a heat exchanger 5 being enlarged is different according to the specof the heat exchanger 5, it is possible for the tube-contacting parts 3f to firmly grasp the tube 7, by adjusting each of the tube-contactingparts 3 f of the tube-grasping body 3 to automatically adapt to thediameter of the tubes through the slits 3 a which are formed betweeneach of said tube-contacting parts 3 f. Also, the bumps 3 e, which areformed at said tube-contacting parts 3 f, press the circumferentialsurface 7 e of the enlargement portion 7 d at the side of opening 7 b ofhairpin tubes 7, in order to build up extruded-parts 7 g extruding inthe axial direction of the tube 7. Thus, it is possible to accuratelyset the reference location of the opening 7 b during the enlargementprocess so that producing a high precision heat exchanger is possible bythe higher precision enlarging process. Also, since the slope 3 b isformed, on the exterior surface of each of the tube-contacting parts 3 fof said tube-grasping body 3, at such a position that said slope 3 b isnot allowed to reach the end-line 3 o of each of said tube-contactingparts 3 f, even if the gap between branches of the hairpin tube or thegap between the neighboring hairpin tubes is significantly reducedcomparing to the prior arts, shrinking of the diameter of each of thetube-contacting parts 3 f, which is caused by the movement of theguide-pipe 3 c toward the opening 7 b, can be stopped before saidguide-pipe 3 c reaches the end-line 3 o of the tube-contacting parts 3f.

Thus, when the exterior diameter 3 q of the guide-pipe 3 c, which isbeing connected at the exterior of the tube-grasping body 3 having thetube-contacting parts 3 f, is determined as the reference diameter (theinterior diameter 3 r of the guide-pipe 3 c when viewed from itself),the exterior diameter 3 n measured between the summits of the slopes 3 bof the opposing tube-contacting parts 3 f which are faced each other,and whose diameter is being reduced during the enlargement through theslits 3 a, it is possible to set the enlargement-occurring point 3 s,where the diameter of the tube-contacting parts 3 f becomes to be theexterior diameter 3 n during the compression in the diameter of thetube-contacting parts 3 f, at the location 3 t, the location shiftedfrom the end-line 3 o of said tube-contacting parts 3 f toward the sideof the opening 7 b, the opposite side of said end-line 3 o of thetube-contacting part. Thus, it is possible to decrease the interiordiameter 3 r of the guide-tube 3 c by the distance shifted. As a result,the exterior diameter 3 q of the guide-pipe 3 c is automaticallyreduced. Also, even if the gap between branches of the hairpin tube 7,the gap between each of the neighboring hairpin tubes 7, or the gapbetween each of the straight insert tubes is significantly reducedcomparing to the prior arts, it is possible to prevent the guide-pipe 3c whose diameter 3 q has been decreased, from being hit by each of theneighboring guide-pipes 3 c, when the opening 7 b of each of straighttubes or hairpin tubes is being connected at its exterior by thetube-contacting parts of the tube-grasping body 3 equipped with saidguide-pipe 3 c. Thus, it is possible to provide an effect of wellproducing the heat exchanger 5, wherein the gap between insert tubes issignificantly reduced for the following example cases: the case wherethe heat exchanger is downsized (downsized insert pipes, etc.) due toreasons of saving in energy or cost, the case where straight tubes orhairpin tubes 7 are inserted in a zigzag pattern, and the case wherestraight tubes or hairpin tubes are inserted in multiple columns such ascolumns of 3, 4, or etc.

Also, according to the current invention, in the heat exchangerproduction apparatus 1 configured as above, since

-   -   the slope 3 b is formed on the exterior surface of each of said        tube-contacting parts 3 f of said tube-grasping body 3, at the        rear side of the bump 3 e which is formed at the side of the        opening 7 b on the interior surface of each of said        tube-contacting parts 3 f, the opposite side of the end-line 3 o        of the tube-contacting part 3 f, in such a way that said slope 3        b is not allowed to reach the end-line 3 o of each of the        tube-contacting parts 3 f of said tube-grasping body 3,        it is possible to set the enlargement-occurring point 3 s, where        the diameter of the tube-contacting parts 3 f becomes to be the        exterior diameter 3 n during the compression in the diameter of        the tube-contacting parts 3 f, at the location 3 t, the        farthermost location shifted from the end-line 3 o of said        tube-contacting parts 3 f toward the side of the opening 7 b,        the opposite side of said end-line 3 o of the tube-contacting        part. Thus, it is possible to minimize the interior diameter 3 r        of the guide-tube 3 c by the distance shifted. As a result, the        exterior diameter 3 q of the guide-pipe 3 c can be set at a        minimum. Also, even if the gap between branches of the hairpin        tube 7, the gap between each of the neighboring hairpin tubes 7,        or the gap between each of the straight insert tubes is        extremely reduced comparing to the prior arts, it is possible to        prevent the guide-pipe 3 c whose diameter 3 q has been        minimized, from being hit by each of the neighboring guide-pipes        3 c, when the opening 7 b of each of straight tubes or hairpin        tubes is being connected at its exterior by the tube-contacting        parts of the tube-grasping body 3 equipped with said guide-pipe        3 c. Thus, it is possible to provide an effect of best producing        the heat exchanger 5, wherein the gap between insert tubes is        extremely reduced for the following example cases: the case        where the heat exchanger is extremely downsized (extremely        downsized insert pipes, etc.) due to reasons of saving in energy        or cost, the case where straight tubes or hairpin tubes 7 are        inserted in a zigzag pattern, and the case where straight tubes        or hairpin tubes are inserted in multiple columns such as        columns of 3, 4, or etc.

Also, according to the current invention, in the heat exchangerproduction apparatus 1 configured as above, since

-   -   said tube-grasping body 3 is equipped with a tool-joining part 3        j for joining or disjoining said tube-grasping body 3, to or        from the tube-grasping body holder 3 l,        it is possible to enable quick change of the tube-grasping body        3 which has been worn, by simply connecting a tool, such as a        driver, to the tool-joining part 3 j, and by rotating said tool.        Also, it is possible to provide a special effect of enabling to        change the tube-grasping body 3 easily, firmly, and within a        very short time, adapting to the gap between branches of the        hairpin tube 7, the gap between the neighboring hairpin tubes 7,        or the gap between or the diameter of each of the neighboring        straight insert tubes.

Also, according to the current invention, in the heat exchangerproduction apparatus 1 configured as above, if

-   -   a limiting means is installed at said tube-grasping body with        tube-contacting parts 3 f when said tube-grasping body 3 is held        by the tube-grasping body holder 3 l, in order to limit the        location of the radial expansion or the axial compression of the        tube-contacting parts 3 f of the tube-grasping body 3,        for example, even if the gap between each of the end-plates (not        shown in the figure) which is installed near the enlargement        portion 7 d of the tube 7 being inserted into the heat radiating        fin 6 in a heat exchanger 5, or the gap between each of the        neighboring insert tubes 7, is reduced, it is possible to        support and keep the tube-grasping body 3 at such a place that        any one of the tube-grasping body holders 3 l is not allowed to        rotate to contact the tube-contacting parts 3 f of neighboring        tube-grasping bodies 3, when each of the tube-contacting parts 3        f of the tube-grasping body 3 is radially increased in its        diameter. As a result, it is possible to provide the effect of        surely avoiding deformation by collision of each of the        tube-contacting parts 3 f of the neighboring tube-grasping        bodies 3, or deformation of said end-plate of the heat exchanger        5 by said tube-contacting parts 3 f.

Also, according to the current invention, in the heat exchangerproduction apparatus 1 configured as above, since

-   -   said guide-pipe 3 c is equipped with a tool-joining part 3 i for        joining or disjoining the guide-pipe 3 c, to or from the        guide-pipe holder 3 d,        it is possible to enable quick change of the guide-pipe 3 c        which has been worn, by simply rotating a tool, such as driver,        to the tool-joining part 3 i, and by rotating said tool. Also,        it is possible to provide a special effect of enabling to change        the guide-pipe 3 c easily, firmly, and within a very short time,        adapting to the gap between branches of the hairpin tube 7, the        gap between the neighboring hairpin tubes 7, or the gap between        or the diameter of each of the neighboring straight insert        tubes.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 illustrates a schematic diagram of a heat exchanger productionapparatus according to the present invention.

FIG. 2 illustrates an embodiment of the heat exchanger productionapparatus of the present invention, where 2A is an enlargedcross-sectional diagram showing major components, 2B is an enlargeddiagram showing major components, 2C and 2D are enlarged cross-sectionaldiagrams of some of major components when insert tubes are enlarged.

FIG. 3 illustrates the status of the slits of the tube-grasping bodyused in the heat exchanger production apparatus of the presentinvention, before the slits are opened, wherein 3A is a front view and3B is a cross-sectional diagram along the H-H line shown in 3A.

FIG. 4 illustrates the guide-pipe used in the heat exchanger productionapparatus of the present invention, where 4A is an enlarged diagram, 4Bis a front view, and 4C is a cross-sectional diagram along the I-I lineshown in 4B.

FIG. 5 illustrates the status of the slits of the tube-grasping bodyused in the heat exchanger production apparatus of the presentinvention, before the slits are opened, wherein 5A is a cross-sectionaldiagram before the insert tube is grasped, and 5B is a cross-sectionaldiagram after the insert tube is grasped.

FIG. 6 illustrates the status of the slits of the tube-grasping bodyused in the heat exchanger production apparatus of the presentinvention, after the slits are opened, wherein 6A is a front view, and6B is a cross-sectional diagram along the L-L line shown in 6A.

FIG. 7 illustrates the status of the slits of the tube-grasping bodyused in the heat exchanger production apparatus of the presentinvention, after the slits are opened, wherein 7A is a cross-sectionaldiagram when an insert tube is grasped if the axis of the insert tube isskewed off from the axis of the tube-grasping body, and 7B is across-sectional diagram when an insert tube with a large diameter isgrasped.

FIG. 8 illustrates an example embodiment of the slits of thetube-grasping body used in the heat exchanger production apparatus ofthe current invention, after the slits are opened.

FIG. 9 illustrates another example embodiment of the slits of thetube-grasping body used in the heat exchanger production apparatus ofthe current invention, after the slits are opened.

FIG. 10 illustrates an example embodiment of a product which is equippedwith the heat exchanger, produced using the tube-grasping body used inthe heat exchanger production apparatus of the current invention,wherein 10A is an air-conditioner having the heat exchanger and 10B isan outdoor unit having the heat exchanger to be used with anair-conditioner.

FIG. 11 illustrates an enlarged cross-sectional diagram of some of majorcomponents of the enclosing bodies, which is used in a heat exchangerproduction apparatus according to the prior arts.

FIG. 12 illustrates a heat exchanger production apparatus of the priorarts, wherein 12A is an enlarged front view when the insert tube isenlarged, 12B is a perspective diagram of the clamp, and 12C is aperspective diagram of another embodiment of the clamp.

DETAILED DESCRIPTION OF THE INVENTION

The current invention relates to a tube-grasping body for grasping aninsert tube in a heat exchanger, heat exchanger production methods andapparatuses utilizing the tube-grasping body, and an air-conditionerand/or its outdoor unit with a heat exchanger produced by the method orthe apparatus. In the following paragraphs, an embodiment of the currentinvention is explained.

The embodiment explained here relates to production of the followingheat exchangers as examples:

-   -   a heat exchanger which is downsized, utilizing the heat        exchanger production apparatus which is equipped with a        guide-pipe as a sliding means, and which is also equipped with a        tube-grasping body being connected at its exterior to said        guide-pipe for enabling said guide-pipe to slide along said        tube-grasping body, and    -   a heat exchanger wherein the diameters of insert tubes are        different or the gap between each of the tubes is significantly        reduced.        However, in association with said heat exchanger production        apparatus, the parts, which are identical to the prior arts, are        not explained. Separate explanation is provided later about an        embodiment of a tube-grasping body, wherein the slit with a        prescribed width is gradually expanded to an expanded width from        a prescribed location toward the opening of the tube, since its        effect is different from that of an embodiment of a        tube-grasping body with the slits which are not expanded in        their widths.

First, in FIG. 1, it is explained about an embodiment of the heatexchanger production apparatus to implement the heat exchangerproduction method, the method having a guide-pipe and a tube-contactingpart itself of the tube-grasping body for grasping an insert tube in aheat exchanger. The component-loading platform 1 c loads a heatexchanger where the gap between branches of each of insert tubes or thegap between neighboring hairpin tubes 7 is significantly reduced, due tothe following reasons:

-   -   the heat exchanger being downsized (by downsized tubes, or etc.)        due to the problems of saving in energy or cost,    -   hairpin tubes 7 being inserted into the heat radiating fin 6 in        a zigzag pattern (not shown in the figure), and    -   hairpin tubes 7 being inserted in multiple columns such as        columns of 3, 4, or etc. (not shown in the figure).        Subsequently, said heat exchanger 5 is pressed and fixed between        the component-loading platform 1 c and the pressing-plate 11 by        lowering the pressing-plate 11 located above.

Next, the base plane 4 d is advanced (not shown in the figure) along theguide rail 12, by operating the round-trip cylinder 4 f of theenclosing-body shifting device 4. At the same time, the driving-cylinder4 e is operated, in order to enclose each of the hairpin part 7 cextruded from the heat radiating fin 6 of the heat exchanger 5, asindicated in FIG. 11, by the tongue shaped concavity 4 g which resemblesa tongue when viewed from the plane of a pair of enclosing-bodies 4 a.Corresponding to said tongue shaped concavity 4 g, the tongue shapedconvexity 4 c, which resembles a tongue when viewed from said plane, isformed on the interior surface of said tongue shaped concavity 4 g. Saidtongue shaped convexity 4 c turns around the U-shaped interiorcircumferential surface of said hairpin part 7 c in order to firmly stopshrinkage of the hairpin tube 7 during the enlarging process.

Next, from the opening 7 b of each of said hairpin tubes 7, as shown inFIG. 2( c), by inserting (the arrow A) each of the tube-enlargingmandrels 2 by a prescribed depth, the enlargement portion 7 d with aprescribed length is formed. Subsequently, by advancing (the arrow B)the tube-grasping body 3, by the tube-grasping body holder 3 l, towardthe circumferential surface 7 e of said enlargement portion 7 d, fromthe opening 7 b of the hairpin tube 7, the tube-grasping body 3 isconnected to the circumferential surface 7 e, in the state where theexterior of said circumferential surface 7 e is surrounded by thetube-contacting parts 3 f.

Afterwards, if the guide-pipe 3 c is moved (the arrow C), by theguide-pipe holder 3 d, in the same direction of the movement of thetube-enlarging mandrel 2, the guide-pipe 3 c presses the slope 3 b whilesliding along the same slope which has been formed on the exteriorsurface of each of said tube-contacting parts 3 f, and which is slantedin the widening direction toward the opening 7 b of the correspondingtube 7. Thus, the diameter of each of the tube-contacting parts 3 f isreduced in the axial direction of the tube-enlarging mandrel 2, by thespace isolation of the prescribed width 3 u of the slits 3 a. As aresult, each of said tube-contacting parts 3 f becomes tightly connectedat its exterior to the guide-pipe 3 c, and, therefore, each of saidtube-contacting parts 3 f becomes to firmly grasp and support thecircumferential surface 7 e of the enlargement portion 7 d of thehairpin tube 7. The tube-grasping body 3 with such guide-pipe 3 c andtube-contacting parts 3 f is shown in FIGS. 3-5, which are explainedlater. Specially, as shown in FIG. 2( d), a bump 3 e is formed at eachof the tube-contacting parts 3 f for pressing (the arrow D) thecircumferential surface 7 e of said enlargement portion 7 d (though thebump explained in FIG. 2( d) is little different in its shape from thebump 3 e in FIGS. 3-5, their functions are the same), at the positionwhere each of the tube-contacting parts meets the enlargement portion 7d of the hairpin tube 7, in order to build up the extruded-part 7 gextruding from the interior circumferential surface 7 f of said hairpin7, in the axial direction of the tube-enlarging mandrel 2. Thus, thecircumferential surface 7 e of the enlargement portion 7 d becomes morefirmly grasped and supported. Therefore, it is possible to surely setthe reference location of the opening 7 b during the enlargementprocess. Next, from this state, if said tube-enlarging mandrel 2 ismoved toward the hairpin part 7 c of the hairpin tube 7, both of thehairpin part 7 c and the opening 7 b are supported. Thus, it is possibleto keep shrinkage of the entire length of the hairpin tubes 7 at aminimum, and it is also possible to produce a high quality heatexchanger having higher precision.

Also, when producing a heat exchanger where the gap between branches ofthe insert tube or the gap between neighboring hairpin tubes issignificantly reduced, since the heat exchanger production apparatus 1having the tube-grasping body 3 and the guide-pipe 3 c indicated inFIGS. 3-5 is configured by the following conditions wherein

-   -   the tube-grasping body is also connectable at the exterior of a        tube-enlarging mandrel 2, for moving back and forth, along said        tube-enlarging mandrel 2 which is penetrable from the opening 7        b of a tube 7 inserted into a heat radiating fin 6 of a heat        exchanger 5;    -   the tube-grasping body is also equipped with a plurality of        tube-contacting parts 3 f, capable of radially expanding or        axially compressing in the cross direction of the longitudinal        length of said tube 7;    -   the tube-grasping body is also equipped with slopes 3 b slanting        gradually in the widening direction toward the opening 7 b of        the corresponding tube, wherein each of the slopes 3 b is formed        on the exterior surface of each of said tube-contacting parts 3        f;    -   the tube-grasping body is also equipped with a sliding means        which radially expands or axially compresses each of said        tube-contacting parts 3 f, by sliding back and forth in the        longitudinal direction of the tube, along said slopes 3 b of the        tube-contacting parts 3 f;    -   a bump 3 e is formed to extrude from the interior surface of        each of said tube-contacting parts 3 f, at the side of the        opening 7 b, in the axial direction of the tube 7;    -   a slope 3 m, which has a straight or curved sloping side, is        formed at said bump 3 e, and slanted in the widening direction,        from the summit 3 p of the bump 3 e, toward the opening 7 b of        the tube 7 facing the end-line 3 o of the tube-contacting part 3        f, in order to prevent said opening 7 b from being deformed by        collision of the bump 3 e with the opening 7 b of the tube 7        when the opening 7 b of the tube 7 is connected at its exterior        to the tube-contacting parts 3 f;    -   a slope 3 g, which has a straight or curved sloping side, is        formed on the interior circumference of said guide-pipe 3 c at        its end side, and slanted in the widening direction toward the        opening 7 b of the corresponding tube 7, in order to reduce the        sliding abrasion against each of the slopes 3 b formed on the        exterior surface of each of said tube-contacting parts 3 f; and    -   said slope 3 b is also formed, on the exterior surface of each        of the tube-contacting parts 3 f of said tube-grasping body 3,        at such a position that the slope 3 b is not allowed to reach        the end-line 3 o of each of said tube-contacting parts 3 f;        even if the diameter of the hairpin tube 7 in a heat exchanger 5        being enlarged is different according to the spec of the heat        exchanger 5, for example, as shown in FIG. 5, by advancing the        tube-grasping body 3, by the tube-grasping body holder 3 l (not        shown in the figure), toward the enlargement portion 7 d of the        tube 7 having a reference diameter of a prescribed tube diameter        7 h, the tube-grasping body 3 becomes connected to the exterior        of said tube 7. Then, by advancing said guide-pipe 3 c (the        arrow J), by the guide-pipe holder 3 c (not shown in the        figure), toward the opening 7 b of the tube 7, each of        tube-contacting parts 3 f of said tube-grasping body 3 becomes        to grasp the enlargement portion 7 d of the tube 7 with a        prescribed diameter 7 h, by shrinking (the arrow K) of the        diameter of each of tube-contacting parts 3 f of said        tube-grasping body 3, through the space distance of the slits 3        a which are formed between said tube-contacting parts 3 f, and        which are of prescribed widths 3 u. Also, the bumps 3 e, which        are formed at said tube-contacting parts 3 f, press the        circumferential surface 7 e of the enlargement portion 7 d and        build up the extruded-parts 7 g (not shown in the figure)        extruding in the axial direction of the tube 7. Thus, the        tube-contacting parts become to firmly grasp and support the        tube, and, therefore, it is possible to accurately set the        reference point of the opening 7 b during the enlarging process,        in order to produce a high precision heat exchanger by the        higher precision enlarging process. Also, even if the gap        between branches of the hairpin tube 7 or the gap between        neighboring hairpin tubes is significantly reduced comparing to        the prior arts, since the slope 3 b is formed, on the exterior        surface of each of the tube-contacting parts 3 f of said        tube-grasping body 3, at such a position that said slope 3 b is        not allowed to reach the end-line 3 o of each of said        tube-contacting parts 3 f, during the phase where the diameter        of each of the tube-contacting parts 3 f is being reduced,        shrinking of the diameter of each of the tube-contacting parts 3        f, which is caused by the movement of the guide-pipe 3 c toward        the opening 7 b, can be stopped before said guide-pipe 3 c        reaches the end-line 3 o of the tube-contacting parts 3 f.

Thus, when the exterior diameter 3 q of the guide-pipe 3 c, which isbeing connected at the exterior of the tube-grasping body 3 having thetube-contacting parts 3 f, is determined as the reference diameter (theinterior diameter 3 r of the guide-pipe 3 c when viewed from itself),the exterior diameter 3 n measured between summits of the slopes 3 b ofthe opposing tube-contacting parts 3 f which are faced each other, andwhose diameter is being reduced during the enlargement through the slits3 a, it is possible to set the enlargement-occurring point 3 s, wherethe diameter of the tube-contacting parts 3 f becomes to be the exteriordiameter 3 n during the compression in the diameter of thetube-contacting parts 3 f, at the location 3 t, the location shiftedfrom the end-line 3 o of said tube-contacting parts 3 f toward the sideof the opening 7 b, the opposite side of said end-line 3 o of thetube-contacting part. Thus, it is possible to decrease the interiordiameter 3 r of the guide-tube 3 c by the distance shifted. As a result,the exterior diameter 3 q of the guide-pipe 3 c is automaticallyreduced. Also, even if the gap between branches of the hairpin tube 7,the gap between each of the neighboring hairpin tubes 7, or the gapbetween each of the straight insert tubes is significantly reducedcomparing to the prior arts, it is possible to prevent the guide-pipe 3c whose diameter 3 q has been decreased, from being hit by each of theneighboring guide-pipe 3 c, when the opening 7 b of each of straighttubes or hairpin tubes is being connected at its exterior by thetube-contacting parts of the tube-grasping body 3 equipped with saidguide-pipe 3 c. Thus, it is possible to provide an effect of wellproducing the heat exchanger 5, wherein the gap between insert tubes issignificantly reduced for the following example cases: the case wherethe heat exchanger is downsized (downsized insert tubes, etc.) due toreasons of saving in energy or cost, the case where straight tubes orhairpin tubes 7 are inserted in a zigzag pattern, and the case wherestraight tubes or hairpin tubes are inserted in multiple columns such ascolumns of 3, 4, or etc.

Also, relating to FIGS. 3-5, if the slope 3 b is formed on the exteriorsurface of each of said tube-contacting parts 3 f of said tube-graspingbody 3, at the rear side of the bump 3 e which is formed at the side ofthe opening 7 b on the interior surface of each of said tube-contactingparts 3 f, the opposite side of the end-line 3 o of the tube-contactingpart 3 f, in such a way that said slope 3 b is not allowed to reach theend-line 3 o of the tube-contacting part 3 f of said tube-grasping body3, it is possible to set the enlargement-occurring point 3 s, where thediameter of the tube-contacting parts 3 f becomes to be the exteriordiameter 3 n during the compression in the diameter of thetube-contacting parts 3 f, at the location 3 t, the farthermost locationshifted from the end-line 3 o of said tube-contacting parts 3 f towardthe side of the opening 7 b, the opposite side of said end-line 3 o ofthe tube-contacting part 3 f. Thus, it is possible to minimize theinterior diameter 3 r of the guide-tube 3 c by the distance shifted. Asa result, the exterior diameter 3 q of the guide-pipe 3 c can be set ata minimum. Also, even if the gap between branches of the hairpin tube 7,the gap between each of the neighboring hairpin tubes 7, or the gapbetween each of the straight insert tubes is extremely reduced comparingto the prior arts, it is possible to prevent the guide-pipe 3 c whosediameter 3 q has been minimized, from being hit by each of theneighboring guide-pipe 3 c, when the opening 7 b of each of straighttubes or hairpin tubes is being connected at its exterior by thetube-contacting parts of the tube-grasping body 3 equipped with saidguide-pipe 3 c. Thus, it is possible to provide an effect of bestproducing the heat exchanger 5, wherein the gap between insert tubes isextremely reduced for the following example cases: the case where theheat exchanger is extremely downsized (extremely downsized insert tubes,etc.) due to reasons of saving in energy or cost, the case wherestraight tubes or hairpin tubes 7 are inserted in a zigzag pattern, andthe case where straight tubes or hairpin tubes are inserted in multiplecolumns such as columns of 3, 4, or etc.

Also, according to the tube-grasping body 3 configured as above, if saidtube-grasping body 3 is equipped with a tool-joining part 3 j forjoining or disjoining said tube-grasping body 3, to or from thetube-grasping body holder 3 l, it is possible to enable quick change ofthe tube-grasping body 3 which has been worn, by simply connecting atool, such as a driver, to the tool-joining part 3 j, and by rotatingsaid tool. Also, it is possible to provide an effect of enabling tochange the tube-grasping body 3 easily, firmly, and within a very shorttime, perfectly adapting to the gap between branches of the hairpin tube7, the gap between the neighboring hairpin tubes 7, or the gap betweenor the diameter of each of the neighboring straight insert tubes.

Also, relating to the guide-pipe 3 c configured as above, if saidguide-pipe 3 c is equipped with a tool-joining part 3 i for joining ordisjoining the guide-pipe 3 c, to or from the guide-pipe holder 3 d, itis possible to enable quick change of the guide-pipe 3 c which has beenworn, by simply rotating a tool, such as driver, to the tool-joiningpart 3 i, and by rotating said tool. Also, it is possible to provide aspecial effect of enabling to change the guide-pipe 3 c easily, firmly,and within a very short time, perfectly adapting to the gap betweenbranches of the hairpin tube 7, the gap between the neighboring hairpintubes 7, or the gap between or the diameter of each of the neighboringstraight insert tubes.

Next, relating to the tube-grasping body of the current invention forgrasping an insert tube in a heat exchanger, an embodiment of thetube-grasping-body equipped with the tube-contacting parts 3 f isexplained, wherein the slits are formed for building up said contactingparts 3 f, and the width of each of the slits is gradually increasedfrom a prescribed width to an expanded width, from a prescribed locationof the slit.

In FIG. 6, in a heat exchanger production apparatus to embody the heatexchanger production method explained above, utilizing the tube-graspingbody 3

-   -   which is also connectable at the exterior of a tube-enlarging        mandrel 2, for moving back and forth, along said tube-enlarging        mandrel 2 which is penetrable from the opening 7 b of a tube 7        inserted into a heat radiating fin 6 of a heat exchanger 5;    -   which is also equipped with a plurality of tube-contacting parts        3 f, capable of radially expanding or axially compressing in the        cross direction of the longitudinal length of said tube 7;    -   which is also equipped with slopes 3 b slanting gradually in the        widening direction toward the opening 7 b of the corresponding        tube, wherein each of the slopes 3 b is formed on the exterior        surface of each of said tube-contacting parts 3 f;    -   which also radially expands or axially compresses each of said        tube-contacting parts 3 f, by a sliding means which moves back        and forth in the longitudinal direction of the tube, along said        slopes 3 b of the tube-contacting parts 3 f; and    -   which is also characterized by the configuration wherein        -   said tube-contacting parts 3 f, capable of radially            expanding or axially compressing, are formed and separated            by a plurality of slits 3 a which are of prescribed widths 3            u, and which are formed in the longitudinal direction of the            tube-grasping body 3, the same direction of the movement of            the tube-enlarging mandrel 2;            if the width of each of said slits 3 a is gradually            increased from said prescribed width 3 u to an expanded            width 3 x, from a prescribed location toward the opening 7 b            of said tube 7, when the side of the opening 7 b of the tube            7 is being connected at its exterior to the tube-contacting            parts 3 f, it is possible to greatly expand (the arrow M)            the maximum open diameter 3 y and the dynamic range (space            distance) of each of the tube-contacting parts 3 f (said            dynamic range is measured from the difference in diameters            between the expansion and the compression states), through            the plural slits 3 a which are separated by a prescribed            width 3 u, and which are formed in the longitudinal            direction of the tube-grasping body 3 to build up said            tube-contacting parts 3 f.

Therefore, as shown in FIG. 7( a), for example, even if the axis of theenlargement portion 7 d of the tube 7 having a prescribed diameter 7 his away, by a small degree, relative to the longitudinal direction ofthe tube-enlarging mandrel, from the axis of the tube-grasping body 3,it is possible, by each of the tube-contacting parts 3 f whose maximumopen diameter 3 y and the dynamic range (the dynamic range beingmeasured from the difference in diameters between the expansion and thecompression states) have been greatly expanded, to provide the effect ofsurely preventing one end from being deformed or transformed bycollision of the end-line of the tube-contacting part 3 f and theopening 7 b of the tube 7.

Also, as shown in FIG. 7( b), if the width of each of said slits 3 a ofthe tube-grasping body 3 is gradually increased from said prescribedwidth 3 u to an expanded width 3 x, from a prescribed location towardthe opening 7 b of said tube 7, it is possible, by each of thetube-contacting parts 3 f whose maximum open diameter 3 y and thedynamic range have been expanded (the dynamic range is measured from thedifference between diameters of the expansion and compression states),to provide the effect of surely preventing one end from being deformedor transformed by collision of the end-line of the tube-contacting part3 f and the opening 7 b of the tube 7 even if the exterior diameter 7 iof the enlargement portion 7 d at the side of the opening 7 b of thetube 7 becomes about the same size (bigger diameter than the referencediameter of a prescribed diameter 7 h) as the interior diameter of thetube-grasping body 3 itself or the interior diameter between thetube-contacting parts 3 f (the interior diameter between the bumps, ifbumps are formed).

Also, relating to the tube-grasping body 3 configured above, if each ofsaid tube-contacting parts 3 f, capable of radially expanding or axiallycompressing, is bent to form a smooth curve with or without a edge onthe bent portion, in the radial direction, from a prescribed location ofsaid slit 3 a toward the opening 7 b of the tube 7, in order togradually expand the width of each of said slits 3 a from the prescribedwidth 3 u to the expanded width 3 x, from a prescribed location, towardthe opening 7 b of the tube 7, it is possible to increase durability asa component, by smoothly sliding the guide-pipe 3 c along said slope 3 bwhich is formed on each of the tube-contacting parts 3 f with or withouta edge on its sloping side, even if the maximum open diameter 3 y andthe dynamic range (said dynamic range is the difference in diametersbetween the expansion and the compression states) of each of thetube-contacting parts 3 f are maximally expanded, through the spacedistance of the expanded widths 3 x, the width expanded from theprescribed width 3 u of the slit 3 a. Also, it is possible to providethe effect of easily and firmly adjusting to maximize the dynamic rangeof each of the tube-contacting parts 3 f, from the maximum open diameter3 y to the minimum diameter (till the so-called grasping operation,though the shrinkage in the axial direction in each of thetube-contacting parts 3 f is different, according to the exteriordiameter of the enlargement portion of the tube), in proportion to thesliding distance of the guide-pipe 3 c.

Also, relating to the tube-grasping body 3 configured as above, since

-   -   a bump 3 e is formed to extrude from the interior surface of        each of said tube-contacting parts 3 f, at the side of the        opening 7 b, in the axial direction of the tube 7; and    -   a slope 3 m, which has a straight or curved sloping side, is        formed at said bump 3 e, and slanted in the widening direction,        from the summit 3 p of the bump 3 e, toward the opening 7 b of        the tube 7 facing the end-line 3 o of the tube-contacting part 3        f, in order to prevent said opening 7 b from being deformed by        collision of the bump 3 e with the opening 7 b of the tube 7        when the opening 7 b of the tube 7 is connected at its exterior        to the tube-contacting parts 3 f,        even if the opening 7 b of the tube 7 contacts the bump 3 e of        each of the tube-contacting parts 3 f, it is possible to enable        the bump 3 e to slide smoothly following the opening 7 b of the        tube 7, by the slope 3 m with the sloping side being straight or        curved, and it is also possible to provide the effect of surely        preventing the opening 7 b of the tube 7 and the tube-contacting        parts 3 f having the bump 3 e, from being deformed or        transformed.

Also, relating to the tube-grasping body 3 and the guide-pipe 3 c,configured as above, since

-   -   a slope 3 g, which has a straight or curved sloping side, is        formed on the interior circumference of said guide-pipe 3 c at        its end side, and slanted in the widening direction toward the        opening 7 b of the corresponding tube 7, in order to reduce the        sliding abrasion against each of the slopes 3 b formed on the        exterior surface of each of said tube-contacting parts 3 f; and    -   said slope 3 b is also formed, on the exterior surface of each        of the tube-contacting parts 3 f of said tube-grasping body 3,        at such a position that the slope 3 b is not allowed to reach        the end-line 3 o of each of said tube-contacting parts 3 f,        under the condition where the gap between branches of the        hairpin tube or the gap between the neighboring hairpin tubes is        significantly reduced comparing to the prior arts, shrinking of        the diameter of each of the tube-contacting parts 3 f, which is        caused by the movement of the guide-pipe 3 c toward the opening        7 b, can be stopped before said guide-pipe 3 c reaches the        end-line 3 o of the tube-contacting parts 3 f during the        shrinking operation of the diameter in each of the        tube-contacting parts 3 f. Thus, when the exterior diameter 3 q        of the guide-pipe 3 c, which is connected at the exterior of the        tube-grasping body 3 having the tube-contacting parts 3 f, is        determined as the reference diameter (the interior diameter 3 r        of the guide-pipe 3 c when viewed from itself), the exterior        diameter 3 n measured between the summits of the slopes 3 b of        the opposing tube-contacting parts 3 f which are faced each        other, and whose diameter is being reduced during the        enlargement through the slits 3 a, it is possible to set the        enlargement-occurring point 3 s, where the diameter of the        tube-contacting parts 3 f becomes to be the exterior diameter 3        n during the compression in the diameter of the tube-contacting        parts 3 f, at the location 3 t, the location shifted from the        end-line 3 o of said tube-contacting parts 3 f toward the side        of the opening 7 b, the opposite side of said end-line 3 o of        the tube-contacting part 3 f. Thus, it is possible to decrease        the interior diameter 3 r of the guide-tube 3 c by the distance        shifted. As a result, the exterior diameter 3 q of the        guide-pipe 3 c is automatically reduced. Also, even if the gap        between branches of the hairpin tube 7, the gap between each of        the neighboring hairpin tubes 7, or the gap between each of the        straight insert tubes is significantly reduced comparing to the        prior arts, it is possible to prevent the guide-pipe 3 c whose        diameter 3 q has been decreased, from being hit by each of the        neighboring guide-pipes 3 c, when the opening 7 b of each of        straight tubes or hairpin tubes is being connected at its        exterior by the tube-contacting parts of the tube-grasping body        3 equipped with said guide-pipe 3 c. Thus, it is possible to        provide an effect of well producing the heat exchanger 5,        wherein the gap between insert tubes is significantly reduced        for the following example cases: the case where the heat        exchanger is downsized (downsized insert pipes, etc.) due to        reasons of saving in energy or cost, the case where straight        tubes or hairpin tubes 7 are inserted in a zigzag pattern, and        the case where straight tubes or hairpin tubes are inserted in        multiple columns such as columns of 3, 4, or etc.

Also, as shown in FIG. 8, relating to said tube-grasping body 3, since

-   -   a sliding means is provided by the guide-pipe 3 c, which moves        back and forth in the longitudinal direction of the tube, along        said slopes 3 b of the tube-contacting parts 3 f; and    -   the maximum exterior diameter 3 v of said tube-grasping body 3        is set below the exterior diameter 3 w of the guide-pipe 3 c,        wherein the maximum exterior diameter 3 v is formed and        configured by the opposing tube-contacting parts 3 f facing each        other in order to build up said slopes 3 b,        it is possible to accommodate said tube-contacting parts 3 f,        which are formed and separated by the slits 3 a with a        prescribed width 3 u, within the exterior diameter 3 w of the        guide-pipe 3 c, in the state where the maximum open diameter 3 y        and the dynamic range (the dynamic range is the difference in        diameters between the expansion and compression states) of each        of the tube-contacting parts 3 f are expanded through expansion        of each of the widths of the slits 3 a to a larger value than a        prescribed width 3 u. Therefore, it is possible to provide the        effect of surely preventing collision by neighboring        tube-contacting parts 3 f, even for the following cases:    -   the case where the space between each of the guide-pipes 3 c is        fully taken up, corresponding to the case where the gap between        branches of the hairpin tube 7, or the gap between each of        neighboring hairpin tubes 7, or the gap between each of straight        tubes being inserted, is significantly reduced comparing to the        prior arts, and    -   the case where the enlargement portion 7 d at the side of the        opening 7 b of the tube 7 is being grasped, by each of the        tube-contacting parts 3 f of each of the tube-grasping bodies 3,        which is accommodated in the interior of each of the neighboring        guide-pipes 3 c.

Also, as indicated in FIG. 9, at the tube-grasping body 3 with saidtube-contacting parts 3 f, if a limiting means such as a groove or aconcavity (not shown in the figure) or a convexity (not shown in thefigure) is installed when said tube-grasping body 3 is held by thetube-grasping body holder 3 l, in order to limit (limiting rotation ofthe tube-grasping body holder 3 l) the location of the radial expansionor the axial compression of the tube-contacting parts 3 f of thetube-grasping body 3 (though not shown in the figure, parts whichcorrespond to the limiting means of the tube-grasping body 3, and whichare fixed at the tube-grasping holder 3 l or other components, arecontacted and limited by such limiting means), it is possible to supportand keep the tube-grasping body 3 at such a place that none of thetube-grasping body holders 3 l is allowed to rotate to contact thetube-contacting parts 3 f of neighboring tube-grasping bodies 3, wheneach of the tube-contacting parts 3 f of the tube-grasping body 3 isradially increased in its diameter, even if the gap between each of theend-plates (not shown in the figure) which is installed near theenlargement portion 7 d of the tube 7 being inserted into the heatradiating fin 6 in a heat exchanger 5, or the gap between each of theneighboring insert tubes 7, is reduced. As a result, it is possible toprovide the effect of surely avoiding deformation by collision of eachof the tube-contacting parts 3 f of the neighboring tube-grasping bodies3, or deformation of said end-plate of the heat exchanger 5 by saidtube-contacting parts 3 f.

If the width of each of said slits 3 a is gradually increased from saidprescribed width 3 u to an expanded width 3 x, from a prescribedlocation toward the opening 7 b of said tube 7, when the side of theopening 7 b is being connected at its exterior to the tube-contactingparts 3 f, it is possible to expand the maximum open diameter 3 y andthe dynamic range of each of the tube-contacting parts 3 f (the dynamicrange is measured from the difference in diameters between the expansionand the compression states), through the plural slits 3 a which areseparated by a prescribed width 3 u, and which are formed in thelongitudinal direction of the tube-grasping body 3 to set up saidtube-contacting parts 3 f; when producing a heat exchanger by the heatexchanger production method comprising:

-   -   the first process wherein        -   an enlargement portion having a prescribed length is formed,            by inserting a tube-enlarging mandrel by a prescribed depth,            from the opening of an insert tube being inserted into a            heat radiating fin of a heat exchanger;    -   the second process wherein        -   the exterior of said enlargement portion is surrounded and            connected, by the tube-grasping body wherein            -   said tube-contacting parts, capable of radially                expanding or axially compressing, are formed and                separated by a plurality of slits which are of                prescribed widths, and which are formed in the                longitudinal direction of the tube-grasping body, the                same direction of the movement of the tube-enlarging                mandrel; and            -   the width of each of said slits is gradually increased                from said prescribed width to an expanded width, from a                prescribed location toward the opening of said tube;    -   the third process wherein        -   the circumferential surface of the enlargement portion of            the tube is firmly grasped and supported by tube-contacting            parts, as the diameter of each of the tube-contacting parts            is reduced in the axial direction to gradually reduce the            expanded width which has been expanded from a prescribed            width from a prescribed position of the slit, by a sliding            means pressing the slopes of the tube-contacting parts,            while sliding, toward the opening of the corresponding tube,            along the same slopes which are slanted in the widening            direction toward the opening of the tube; and    -   the forth process wherein,        -   in the state where the circumferential surface of the            enlargement portion of the tube is firmly grasped and            supported by the tube-contacting parts, the tube-enlarging            mandrel is further inserted into the tube to join the heat            radiating fin and the tube together.

Thus, as explained in FIG. 7( a) above, for example, even if the axis ofthe enlargement portion 7 d of the said tube 7 having a referencediameter of a prescribed tube diameter 7 h is away, by a small degree,relative to the longitudinal direction of the tube-enlarging mandrel 2,from the axis of the tube-grasping body 3, it is possible, by each ofthe tube-contacting parts 3 f whose maximum open diameter 3 y and thedynamic range (the dynamic range is measured from the difference of thediameters between the expansion and compression states) have beengreatly expanded, to provide the effect of surely preventing one endfrom being deformed or transformed by a collision of the end-line of thetube-contacting part 3 f and the opening 7 b of the tube 7.

Also, relating to the case where a heat exchanger is produced by themethod above, as shown in FIG. 7( b), if the width of each of said slits3 a of the tube-grasping body 3 is gradually increased from saidprescribed width 3 u to an expanded width 3 x, from a prescribedlocation toward the opening 7 b of said tube 7, it is possible, by eachof the tube-contacting parts 3 f whose maximum open diameter 3 y and thedynamic range (the dynamic range is measured from the difference of thediameters between the expansion and compression states) have beenexpanded, to provide the effect of surely preventing one end from beingdeformed or transformed by collision of the end-line of thetube-contacting part 3 f and the opening 7 b of the tube 7, even if theexterior diameter 7 i of the enlargement portion 7 d at the side of theopening 7 b of the tube 7 becomes about the same size (bigger than thereference diameter of a prescribed diameter 7 h) as the interiordiameter of the tube-grasping body 3 itself or the interior diameterbetween the tube-contacting parts 3 f (the interior diameter between thebumps, if bumps are formed).

Thus, if a heat exchanger 5, produced by the method using thetube-grasping body, is placed in a prescribed casing 20 a with variouscomponents such as an air blower (FIG. 10( a)), or, in an outdoor unit21 used in an air conditioner 20 (FIG. 10( b)), the products adoptingsuch a heat exchanger enables a decrease in logistics cost or productcost, due to the downsized heat exchanger due to the decrease in thetube diameter, or the gap between neighboring tubes.

Also, relating to the case where the heat exchanger, produced by themethod of the current invention explained above, is used in an airconditioner 20 or in an outdoor unit 21 used in an air conditioner 20,it is not implied to exclude air conditioners such as a so-calledcentralized air conditioner which is referred to as either an airhandling unit or a fan coil unit, or a so-called individual airconditioner which is referred to as either a package air conditioner ora room air conditioner. Thus, for any air conditioner using a heatexchanger, it is not implied to exclude anything such as its detailedconfiguration, the shape, the size, the system construction. Also, itdoes not exclude anything such as its use or sales area, if a heatexchanger produced by the method of the current invention is used inother various products.

Also, for an embodiment where tubes other than hairpin tubes areinserted, for example, for the case where multiple straight tubes (notshown in the figure) are inserted, it is not implied to limit anythingsuch as the tube material, the shape, kinds, quantity, the insertionpattern, and etc.

Also, relating to the embodiment explained above, though a so-calledvertical typed enlargement apparatus is explained, as an example of theheat exchanger production apparatus with the tube-grasping body 3 whichis connected at its exterior to the guide-pipe 3 c to enable theguide-pipe to slide along said tube-grasping body, it is not implied toexclude a so-called horizontal typed enlargement apparatus. Also,relating to the so-called vertical typed enlargement apparatus, it isnot implied to exclude anything such as detailed configuration, kinds,characteristics, or etc., as well as the quantity of the tube-contactingparts, the quantity of the tube-grasping bodies or the tube-enclosingbodies, ways of arranging them, and their location of installation.

INDUSTRIAL APPLICABILITY

The current invention relates to a tube-grasping body for grasping aninsert tube in a heat exchanger, heat exchanger production methods andapparatuses utilizing the tube-grasping body, and an air conditionerand/or an outdoor unit equipped with the heat exchanger produced by themethods and apparatuses; wherein

-   -   the tube-grasping body enables the insert tube to be enlarged to        connect to a heat radiating fin for producing a heat exchanger,        still keeping the total length of insert tubes at an almost same        level comparing, even after the insert tube is enlarged by        inserting into each of through holes of heat radiating fins in        heat exchangers overlaid in their multitudes; and    -   said tube-grasping body prevents the opening of the tube and the        end-line of each of the tube-contacting parts of the        tube-grasping body, from being deformed or damaged by collision        between them, and also firmly grasps the opening side of insert        tubes sitting at the interior side in the heat exchanger, as        well as the tubes sitting at the exterior side in the heat        exchanger, in order to resolve all the problems occurring in the        following example cases: the case where the gap between insert        tubes is decreased to enable them to be inserted into a heat        radiating fin in multiple columns such as columns of 3, 4, or        etc., the case where the diameters of insert tubes being        enlarged are different according to the spec of the heat        exchanger, the case where the gap between each of straight tubes        or hairpin tubes being inserted into said heat radiating fin is        significantly decreased comparing to the prior arts, the case        where the exterior diameter of the insert tube becomes about the        same size as the interior diameter of the tube-grasping body        itself or the interior diameter between the tube-contacting        parts (the interior diameter between the bumps if bumps are        formed on the interior surface of the tube-contacting parts),        and the case where the axis of said enlargement portion is away,        by some degree, relative to the direction of the longitudinal        length of the tube-enlarging mandrel, from the axis of the        tube-grasping body.

Although the preferred embodiments of the present invention have beendisclosed for illustrative purposes, those skilled in the art willappreciate that various modifications, additions and substitutions arepossible, without departing from the scope and spirit of the inventionas disclosed in the accompanying claims.

What is claimed is:
 1. A tube-grasping body for grasping an insert tubein a heat exchanger, the tube-grasping body which is used in a heatexchanger production apparatus 1; which is also connectable at theexterior of a tube-enlarging mandrel 2, for moving back and forth, alongsaid tube-enlarging mandrel 2 which is penetrable from the opening 7 bof a tube 7 inserted into a heat radiating fin 6 of a heat exchanger 5;which is also equipped with a plurality of tube-contacting parts 3 f,capable of radially expanding or axially compressing in the crossdirection of the longitudinal length of said tube 7; which is alsoequipped with slopes 3 b slanting gradually in the widening directiontoward the opening 7 b of the corresponding tube, wherein each of theslopes 3 b is formed on the exterior surface of each of saidtube-contacting parts 3 f; which also radially expands or axiallycompresses each of said tube-contacting parts 3 f, by a sliding meanswhich moves back and forth in the longitudinal direction of the tube,along said slopes 3 b of the tube-contacting parts 3 f; and comprising:a configuration wherein, said tube-contacting parts 3 f, capable ofradially expanding or axially compressing, are formed and separated by aplurality of slits 3 a which are of prescribed widths 3 u, and which areformed in the longitudinal direction of the tube-grasping body 3, thesame direction of the movement of the tube-enlarging mandrel 2; and thewidth of each of said slits 3 a is gradually increased from saidprescribed width 3 u to an expanded width 3 x, from a prescribedlocation toward the opening 7 b of said tube
 7. 2. A tube-grasping bodyaccording to claim 1, for grasping an insert tube in a heat exchanger,the tube-grasping body comprising: a configuration wherein, a slidingmeans is provided by the guide-pipe 3 c, which moves back and forth inthe longitudinal direction of the tube, along said slopes 3 b of thetube-contacting parts 3 f; and the maximum exterior diameter 3 v of saidtube-grasping body 3 is set below the exterior diameter 3 w of theguide-pipe 3 c, wherein the maximum exterior diameter 3 v is formed andconfigured by the opposing tube-contacting parts 3 f facing each otherin order to build up said slopes 3 b.
 3. A tube-grasping body accordingto claim 1, for grasping an insert tube in a heat exchanger, thetube-grasping body comprising: a configuration wherein, each of saidtube-contacting parts 3 f, capable of radially expanding or axiallycompressing, is bent to form a smooth curve with or without a edge onthe bent portion, in the radial direction, from a prescribed location ofeach of said slits 3 a toward the opening 7 b of the tube 7, in order togradually expand the width of each of said slits 3 a from the prescribedwidth 3 u to the expanded width 3 x, from a prescribed location, towardthe opening 7 b of the tube
 7. 4. A tube-grasping body according toclaim 1, for grasping an insert tube in a heat exchanger, thetube-grasping body comprising: a configuration wherein, a bump 3 e isformed to extrude from the interior surface of each of saidtube-contacting parts 3 f, at the side of the opening 7 b, in the axialdirection of the tube 7; and a slope 3 m, which has a straight or curvedsloping side, is formed at said bump 3 e, and slanted in the wideningdirection, from the summit 3 p of the bump 3 e, toward the opening 7 bof the tube 7 facing the end-line 3 o of the tube-contacting part 3 f,in order to prevent said opening 7 b from being deformed by collision ofthe bump 3 e with the opening 7 b of the tube 7 when the opening 7 b ofthe tube 7 is connected at its exterior to the tube-contacting parts 3f.
 5. A tube-grasping body according to claim 1, for grasping an inserttube in a heat exchanger, the tube-grasping body comprising: aconfiguration wherein, a limiting means is installed at saidtube-grasping body 3 having tube-contacting parts 3 f when saidtube-grasping body 3 is held by the tube-grasping body holder 3 l, inorder to limit the location of the radial expansion or the axialcompression of the tube-contacting parts 3 f of the tube-grasping body3.
 6. A tube-grasping body according to claim 2, for grasping an inserttube in a heat exchanger, the tube-grasping body comprising: aconfiguration wherein, a slope 3 g, which has a straight or curvedsloping side, is formed on the interior circumference of said guide-pipe3 c at its end side, and slanted in the widening direction toward theopening 7 b of the corresponding tube 7, in order to reduce the slidingabrasion against each of the slopes 3 b formed on the exterior surfaceof each of said tube-contacting parts 3 f; and said slope 3 b is alsoformed, on the exterior surface of each of the tube-contacting parts 3 fof said tube-grasping body 3, at such a position that the slope 3 b isnot allowed to reach the end-line 3 o of each of said tube-contactingparts 3 f.